Radio Galaxy Zoo Talk

Friday, 21 February, 2014: Very Strange Spirals? - GZ forum Object of the Day

  • JeanTate by JeanTate

    Friday, 21 February, 2014: Very Strange Spirals? is the title of a thread in the Object of the Day Board in the (now closed) Galaxy Zoo forum (GZF). It is largely about galaxies which seem to be not ellipticals and which seem to be associated with FIRST or NVSS radio emission extending well beyond the optical boundary. Much, perhaps most, of the contents is already recorded in the Hourglass sources associated with spiral galaxies thread here in Radio Galaxy Zoo Talk (RGZT); however, I think it would be useful to have a copy of here.

    That's what this thread is; as best I can reproduce them, here are all the posts in that thread. Note: the GZF and RGZT have different formatting, and some of what was allowed in GZF is not possible here (e.g. colors, emoticons) so the appearance of many posts will be significantly different. However, the content should be the same.

    Some conventions: GZF post author, date (in GZF format), and post title (if different from the OP) kick off the RGZT post; if the post was edited, that info is at the bottom. Posts in the thread, or parts of them, which are subsequently quoted are not always reproduced; rather, an [author, date] placeholder - with or without a link - is given (I may add the quoted text, and all links, later). {text in curly brackets indicates WIP; I plan to edit all these over the next week or so, so there will be no more WIPs}

    Posted

  • JeanTate by JeanTate

    JeanTate, February 21, 2014, 03:12:33 pm

    enter image description here

    No, that's not a strange spiral! 😛 That's M87, perhaps the most famous giant-elliptical-with-an-active-SMBH-and-jet; you can see the jet in the optical in this DR10 SDSS image (it's the small white streak at ~2 o'clock).

    If we change the scale in a bit, and switch to the radio part of the spectrum, the jet is much more obvious, and we can also see huge clouds of plasma (hot, ionized gas), called lobes ... and the stars have disappeared (source, data is from the Very Large Array radio telescope):

    enter image description here

    Radio jets and lobes and giant elliptical galaxies are common companions; the super-massive black holes (SMBHs) associated with AGNs (active galactic nuclei) in elliptical galaxies somehow seem to often produce one or two radio jets and/or radio tails and/or lobes1.

    enter image description here

    The galaxy in the center is, obviously, not an elliptical. It is also - obviously - associated with a pair of radio jets/lobes. This galaxy is called 0313-192 :😃 and is the subject of a 2006 paper by W. Keel, R. White, F. Owen, and M. Ledlow2 (you might recognize the first author ... he's none other than our very own zooite, NGC3314!).

    Since 2006, a small number of papers have reported similar spiral/radio jet/lobe associations; unfortunately, all the objects seem to be like 0313-192, outside the SDSS footprint! 😦

    So, there are (tens of? hundreds of??) thousands of ellipticals-with-jets/lobes, but just a tiny handful of spirals-with-jets/lobes, maybe only three. Or, as raynorris (scientist) said, on December 19 2013, over in Radio Galaxy Zoo (RGZ) Talk:

    Keep an eye out for any #hourglass sources that seem to be hosted by galaxies that look spiral in the infrared. These objects are incredibly rare in the local Universe (only 2 or 3 known) and we may not see any in Radio Galaxy Zoo, but if someone does find one, that would be worth writing a paper about (with the discoverer as co-author, of course). The rarity of radio-loud spirals is thought to be because the radio jets heat up and disrupt the gas in the spiral, switching off star formation, and turning the galaxy into a "red dead" elliptical. But we might find one or two where the jets have only just switched on and haven't yet destroyed the spiral.

    enter image description here

    enter image description here

    enter image description here

    enter image description here

    That is a compilation of SDSS DR10 images of galaxies which seem to be associated with jets/lobes, found by RGZ zooites; respectively (click the links for details): infobservador (ARG0002zck, SDSS J154336.07+110512.9), WizardHowl (ARG0001zj8, SDSS J122640.22+253855.5), infobservador (ARG0002esa, SDSS J140535.56+190612.9), and WizardHowl3 (ARG00022wh, SDSS J112811.63+241746.9). It's not complete - there are certainly others which have been reported by zooites, in RGZ - but they're the only ones I could find after an hour or two's searching4 (and which are more than a spiral associated with radio emission only in/from the nucleus/bulge).

    Can you find spirals with jets or lobes, 'hourglass' or 'doublelobe' radio sources? Come along to RGZ and start classifying! ;D

    1 for more on this topic check out the GZ blog posts Tailed Radio Galaxies: Cometary-Shaped Radio Sources in Clusters of Galaxies (Part 1), More Information on Tailed Radio Galaxies (Part 2), How do black holes form jets?, The Curious Lives Of Radio Galaxies – Part One, and The Curious Lives of Radio Galaxies – Part Two (there are more, this is just a 'starter selection')

    2 The image is from Hubblesite, "Credit: NASA, W. Keel (University of Alabama), M. Ledlow (Gemini Observatory), F. Owen (NRAO) and AUI/NSF"

    3 Unfortunately, I don't seem to be able to make composite SDSS/radio images 😢

    4 Talk's search tool has got to be one of the primitive, inflexible, tiresome search tools ever invented! 😠

    ETA: I've added some names to the RGZ candidates, to more easily keep track of them

    Last Edit: February 26, 2014, 09:40:01 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    AlexandredOr, February 21, 2014, 05:41:46 pm

    Great OotD !!

    Many thanks Jean 😃

    Posted

  • JeanTate by JeanTate

    JeanTate, February 22, 2014, 12:29:31 am

    Did any GZ zooites discover unusual radio galaxies? is the title of a thread I began earlier today, over in RGZ (Radio Galaxy Zoo) Talk.

    Here's what I posted (extract):

    As of just now, there are 262 posts in the GZ forum's Radio source thread, dating from December 09, 2007.

    Many posts in that thread report a positional (on the sky) co-location of an SDSS object - usually a galaxy - and a radio source as identified in an online catalog, often NED; quite a few posts do not report the source for the radio object.

    [...]

    Is there a reasonably straight-forward way of checking what zooites have posted in that thread?

    For example, how to obtain a FIRST image, with the appropriate 'plate scale', and overlay it on the SDSS image of what is obviously a spiral galaxy (to see, for example, if it's an hourglass or doublelobe, or if there's a jet)?

    Posted

  • JeanTate by JeanTate

    JeanTate, February 22, 2014, 12:43:18 am

    I posted this, in the Hourglass sources associated with spiral galaxies thread in RGZ Talk:

    Friday, 21 February, 2014: Very Strange Spirals? {link removed} is an OOTD (Object of the Day) I just posted in the Galaxy Zoo forum.

    In it I posted SDSS images of four galaxies which RGZ zooites have found to be associated with radio structures that are more than just nuclear, perhaps jet(s) and/or lobe(s); "found" as in posted here in a Talk thread.

    I'm sure there are more, but I grew so frustrated with my inability to find things here, efficiently and effectively, that I gave up looking after a couple of hours.

    Normally I'd post composite images - SDSS and FIRST overlaid, for example - but failed in this case, because I discovered I do not know how to do this, quickly and easily. Anyone?

    WizardHowl replied, very soon afterwards:

    This was one found by antikodon that I remembered HAndernach commented on: http://radiotalk.galaxyzoo.org/#/subjects/ARG00036hs

    If you click the link, you'll see that zooite antikodon wrote, on January 27 2014 2:11 PM, "#overedge #doublelobe host (?)"; HAndernach (SCIENTIST) replied, at 8:49 PM the same day, "SDSS J132435.81+084635.5= ASK 482820.0, an IR- and HI emitting spiral with an FRII morphology, EXTREMELY RARE, should be followed up!"

    Here is SDSS J132435.81+084635.5 (DR10), a galaxy whose morphology is classified as "Spiral" in GZ1, and whose spectroscopic redshift is 0.044:

    enter image description here

    And here is a FIRST image, centered on the brighter lobe (the spiral is about midway between the two faint, extended sources):

    enter image description here

    Posted

  • JeanTate by JeanTate

    c_cld, February 25, 2014, 09:59:20 pm

    [JeanTate February 22, 2014, 12:43:18 am]

    Sorry, there are no radio source at the left of the spiral opposite to the radio lobe of ARG00036hs. I see only noise.

    You could check by a FIRST Catalog Search on the position of the spiral 1237671956441596126 at coords 13:24:35.81, +08:46:35.57 with a radius of 4.5 arcmin.

    Search Results

    Searching for first_cat sources within 270.000 arcsec of
    13 24 35.810 +08 46 35.57 (J2000)

    Map RMS at search position is 0.149 mJy/beam
    Catalog detection limit (including CLEAN bias) at source position is 1.00 mJy/beam

    3 sources found within 270.000 arcsec

    -------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    Do Get Get | Search RA (2000) Dec (2000) Side Peak Int. RMS Deconv. Deconv. Deconv Meas. Meas. Meas. Field Name SDSS Closest SDSS SD 2MAS Closest 2MASS Mean Mean RMS
    NED Opt FRST | Distance lobe Flux Flux (mJy/ MajAx MinAx PosAng MajAx MinAx PosAng Mtch SDSS i Cl Mtch 2MASS K Epoch Epoch Epoch
    SrchImg Img | (arcsec) Prob (mJy/bm) (mJy) beam) (arcsec) (arcsec) (deg) (arcsec) (arcsec) (degrees) <8" Sep(") (mag) <8" Sep(") (mag) (year) (MJD) (MJD)
    -------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    NED OPT FIMG | 68.5 13 24 31.345 +08 46 53.22 0.016 1.92 17.35 0.147 16.47 14.22 71.7 17.33 15.21 71.7 13240+08421I 0 99.00 99.00 - 0 99.00 99.00 2000.062 2451567.0 0.410
    NED OPT FIMG | 84.1 13 24 30.273 +08 46 54.03 0.014 2.19 7.19 0.146 9.23 7.16 76.6 10.69 8.97 76.6 13240+08421I 0 99.00 99.00 - 0 99.00 99.00 2000.062 2451567.0 0.413
    NED OPT FIMG | 203.9 13 24 32.185 +08 49 52.22 0.014 10.45 11.58 0.152 2.57 0.16 59.1 5.98 5.40 59.1 13240+08421I 3 0.16 15.70 g 1 0.12 13.95 2000.061 2451566.9 0.586
    -------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

    Redo this search for having images on clicking the links provided in the results.

    To me, Object FIRSTJ132430.2+084654 looks like a hourglass without optical counterpart 😦

    Posted

  • JeanTate by JeanTate

    JeanTate, February 26, 2014, 01:56:43 am

    My first attempt at producing FIRST plus SDSS images, of the candidates.

    Here's the last candidate in the OP, SDSS J112811.63+241746.9 (ARG00022wh - that's a link):

    enter image description here

    And here's the same object, zoomed out a bit, with FIRST data added, in red1

    enter image description here

    More later.

    1 Yes, it's mostly artistic, in that the intensity/flux transform is, um, rather arbitrary; the pixels in the FIRST data were smoothed with a Gaussian blur

    ETA: I've added some names to the RGZ candidates, to more easily keep track of them

    Last Edit: February 26, 2014, 01:53:25 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, February 26, 2014, 02:59:21 am ARG0002esa SDSS J140535.56+190612.9 (infoservador)

    The second-last one, SDSS J140535.56+190612.9 (ARG0002esa - that's a link):

    enter image description here

    Zoomed out, same scale as in my last post (0.36"/pix), but no grid:

    enter image description here

    ETA: I've added some names to the RGZ candidates, to more easily keep track of them

    UPDATE: SkyView composite, SDSS DR7 r-band (DR10 wouldn't load, strange) with FIRST contours in red (0 min, 6 levels, contour smoothing 8 ) and DR10 image (432"x432", 600x600 pix @0.72"/pix)):

    enter image description here

    Is this galaxy - the Eos - the likely host of the radio emission? Of the nuclear emission, certainly. Of the oddly-shaped, extended FIRSTJ140538.4+190606 source? There's what could be core radio emission ~2' to the E (left), but no apparent optical host (several very faint galaxies are possible), and no second lobe further E. Nor is there a counterpart lobe, to the W of the Eos. So we're left with "maybe".

    fair

    Last Edit: June 17, 2014, 01:38:46 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, February 26, 2014, 03:23:03 am

    Last one for now, the second candidate, SDSS J122640.22+253855.5 (ARG0001zj8 - that's a link):

    enter image description here

    The scale on this one is 0.18"/pix, so it looks rather noisy:

    enter image description here

    Over in RGZ Talk, in the spiral galaxy with doublelobe emission thread, WizardHowl has posted several more interesting objects; I'll add the ones which seem to me to be good disk-galaxy-with-radio-jet(s)/lobe(s) later.

    ETA: I've added some names to the RGZ candidates, to more easily keep track of them

    Last Edit: February 26, 2014, 01:59:32 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    c_cld, February 26, 2014, 02:03:44 pm

    Known spiral with radio jet: NGC 5548 , UGC 09149, Mrk 1509 , WISE J141759.55+250812.7

    SDSS J141759.54+250812.7 1237665532785786979 z spec=0.016

    enter image description here

    FIRST cutout:

    enter image description here

    SDSS and FIRST images side by side with Aladin:

    enter image description here

    The first lobe is at a projected linear size of 54arcsec from the core and the further at 1.7 arcmin, i.e. 17.66kpc and 33.35kpc respectively at redshift 0.0162 😄

    Last Edit: February 26, 2014, 02:23:12 pm by c_cld

    Posted

  • JeanTate by JeanTate

    c_cld, February 26, 2014, 03:03:18 pm

    Another spectacular AGN previously posted in Active galaxies with ionized gas clouds

    SDSS J084002.36+294902.6 1237660961862189211 z 0.06484

    2MASX J08400233+2949027 -- Seyfert 2 Galaxy Morphological type: Sc D ~

    FIRST J084000.8+294838

    enter image description here

    FIRST cutout:

    enter image description here

    My coadded SDSS/FIRST images:

    enter image description here

    The north lobe is coincident with the pink cloud in SDSS told in AGN post!
    8) 8)

    [edit]
    This object SDSS J084002.36+294902.6 587735240637284507, 4C 29.30

    is tabulated in Table 1. Candidate AGN with extended emission-line clouds (T=found in targeted survey of known AGN in column Search) of paper The Galaxy Zoo survey for giant AGN-ionized clouds: past and present black-hole accretion events by William C. Keel, S. Drew Chojnowski et al. , 20 Dec 2011 8)

    Last Edit: February 27, 2014, 05:19:32 pm by c_cld

    Posted

  • JeanTate by JeanTate

    JeanTate, February 26, 2014, 04:02:12 pm ARG0002zck SDSS J154336.07+110512.9 (infobservador)

    Finishing off the four candidates in the OP, ARG0002zck, SDSS J154336.07+110512.9:

    enter image description here

    The scale on this one is also 0.18"/pix, so it looks rather noisy:

    enter image description here

    As noted in the RGZ thread discussing this object, it's possible the radio source is an hourglass, with the host a faint IR source in the center (there's no SDSS object at that location); if so, it'd be a chance alignment. 😦 I'll see if I can create a WISE+FIRST composite image later.

    ETA: Later is now. The cyan image is WISE 4.6μ (contrast boosted, and blurred); the red the same FIRST image as used in the composite above. The bright 4.6μ IR source in the center is the disturbed (merging spiral?) galaxy seen clearly in the SDSS image; it looks structureless in the WISE image because the WISE PSF has a FWHM of ~5":

    enter image description here

    UPDATE: I'm revisiting the objects I'd posted earlier, with a view to applying the two criteria consistently.

    ARG0002zck | SDSS J154336.07+110512.9 | infobservador | discovery (January 14 2014 10:38 PM) | images | 0.084 sp

    Start with the DR10 image, scale 0.18"/pix, 108"x108", centered on SDSS J154336.07+110512.9:

    enter image description here

    Yes! not a boring elliptical.

    SkyView composite, DR7 SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 4 levels, contour smoothing 8 ) and above DR10 image:

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission? We definitely need a radio astronomer to weigh in on that! :😃 However, it could be an hourglass, or a jet/lobe; either way, the axis seems to point right at the galaxy's nucleus. To be conservative, I'd have to say "maybe", so fair (but wouldn't be soooo cool if there were a faint counter lobe - symmetrically placed of course).

    UPDATE 2: In the RGZ Talk thread The IR source is like a cross, a post by a radio astronomer:

    [42jkb SCIENTIST (June 17 2014 6:05 AM)] I would have to say that the spiral galaxy is not related to the radio emission. The radio indicates a double lobe structure so I would say that it is related to another galaxy which is too faint for SDSS to detect.

    So, a demotion to poor. 😦

    Last Edit: June 17, 2014, 08:31:02 am by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, February 26, 2014, 07:49:01 pm

    Still in catch-up mode ...

    [JeanTate, February 21, 2014, 03:12:33 pm]

    From the Radio source thread:

    {Quote from: c_cld December 03, 2011, 03:16:27 pm}

    {Quote from: c_cld February 22, 2014, 09:48:04 pm}

    Speca is, obviously, in the SDSS footprint. :😃

    But the Hota+ 2011 paper does not cite Keel+ 2006! 😮

    It does, however, cite a 1998 one, "An Unusual Radio Galaxy in Abell 428: A Large, Powerful FR I Source in a Disk-dominated Host" (by Ledlow, Owen, and Keel), which is about the same "0313-192" galaxy. :😃

    Posted

  • JeanTate by JeanTate

    JeanTate, February 26, 2014, 08:03:50 pm

    Still from that thread:

    {Quote from: c_cld February 22, 2014, 07:27:24 pm}

    Also posted, by c_cld, in the RGZ Talk thread Did any GZ zooites discover unusual radio galaxies?1 Some discussion ensued:

    [me (February 23 2014 3:14 PM)] Morphologically, the host seems to me to be a disturbed disk galaxy, likely a merger. It's an AGN, and it clearly has two radio lobes, making it a DRAGN. It would thus seem to meet raynorris (scientist)'s criterion for being a radio-loud spiral. Yet as it's a 3C object, it's surely been investigated to death a long time ago, so what are we missing?

    Here's the DR10 image, zoomed in:

    enter image description here

    .

    [c_cld (February 23 2014 3:56 PM)] 3C 285

    The Interaction between Radio Lobes and Hot Gas in the Nearby Radio Galaxies 3C 285 and 3C 442A

    paper related to proposal OPTICAL EMISSION IN DOUBLE RADIO GALAXY LOBES: CYCLE 4, HST Proposal 5156, Philippe Crane, NASA Headquarters

    .

    [WizardHowl (February 23 2014 3:57 PM)] I wouldn't assume that just because a radio-loud galaxy is in 3C it means we won't learn anything from looking them up in SDSS - there's always the possibility the association between the radio and optical has not been made before. This applies especially to strange radio morphologies as well as galaxies that are very faint in optical. As an example look at 3C 343, which appears in RGZ as http://radiotalk.galaxyzoo.org/#/subjects/ARG00001qs and has an optical host in SDSS: I could not find a spectrum for the host galaxy in NED/SDSS! By all means add the above DRAGN spiral to the list of objects in the thread started by raynorris 😃

    1 Link takes you to the thread; while you can sometimes find a way to get the URL of an individual post in a v2 Talk thread, in this case I couldn't, so you'll just have to wade through the whole thread to find the posts I am referring to. 😛

    Posted

  • JeanTate by JeanTate

    JeanTate, February 26, 2014, 08:15:33 pm

    [JeanTate February 21, 2014, 03:12:33 pm] 3 Unfortunately, I don't seem to be able to make composite SDSS/radio images 😢

    Over in the Radio source thread:

    [planetaryscience February 24, 2014, 03:32:09 pm] may I just ask: Where is everyone getting these images from?

    [c_cld c_cld on February 24, 2014, 03:42:36 pm] Superposition image is my manual work of stacking images from

    SDSS DR10 Chart tool

    and

    Extract FIRST Image Cutouts

    😛

    This is my chance to publicly thank c_cld for posting the link to Stega, and, more importantly, to helping me work out how to create composite/superposition/overlay images! 8) 😗

    My source for WISE and FIRST images is NASA's SkyView; I use the SkyView Query Form to obtain black-n-white JPG files, 500x500 pix in size, and with a 'plate scale' the same as that of the SDSS DR10 image I plan to use. Of course, it's important to make sure that the (RA, Dec) of the center of the images is the same! 😛 I then process the JPG images with GIMP (I'm sure any decent image processing tool would work just as well), upload to Photobucket (and there are plenty of other such web-based services), ...

    Posted

  • JeanTate by JeanTate

    JeanTate, February 26, 2014, 09:39:25 pm

    One of the things which Talk is good for is Collections.

    I have a RGZ one, called 'Spirals' with a jet (or jets) and/or a lobe (or lobes), into which I have been putting candidate objects, as I myself have found, and as noted by other zooites. It will surely contain objects that do not really belong, even as candidates; for example, a radio source may appear to coincide with an object which a RGZ zooite thinks is a spiral, but it may turn out to be not a spiral, or for the radio source to be nuclear (either an AGN or a nuclear starburst) or associated with a region of intense star-formation (where many SNR may reside).

    As I identify good candidates, I'll post them here - together with composite FIRST + WISE/SDSS images, as appropriate - and add a note to the objects in the collection.

    Posted

  • JeanTate by JeanTate

    JeanTate, February 26, 2014, 10:08:07 pm

    [c_cld February 25, 2014, 09:59:20 pm]

    Here's a composite FIRST + SDSS image; note that the E lobe (on the left) is pretty faint, but seems to be above the general noise (scale is 0.36"/pix):

    enter image description here

    And here's a triple composite, NVSS (in cyan) + FIRST (red) + SDSS (same scale):

    enter image description here

    The resolution of NVSS is much lower than even WISE; in fact, the whole image is only a few 'resolution-elements' wide! 😛 Nevertheless, it seems that the E lobe is quite real. 8) Maybe I should produce an even more zoomed-out composite image ...

    Posted

  • JeanTate by JeanTate

    JeanTate, February 27, 2014, 03:29:41 pm

    This will likely be the last candidate I post here for a while (PM me if you'd like to know why 😉). SDSS J120339.20+275537.2, ARG0001uiz was first commented on by WizardHowl (I think), and is another example of a double lobe/jet with only one being visible in FIRST (the other is clear in NVSS).

    The likely host galaxy itself is very modest, but its DR10 morphology is definitely not that of an elliptical ('pointy ends', ellipticity too extreme):

    enter image description here

    FIRST + SDSS composite, scale is 0.36"/pix:

    enter image description here

    To illustrate what DocR (Lawrence Rudnick) means*, here's an NVSS + FIRST composite, with the same scale (I'll do a 'zoomed out' NVSS + FIRST composite later):

    enter image description here

    Here's his own pair of images** (FIRST then NVSS):

    enter image description here

    *"This is another beautiful example where there is a weak lobe on the other side of the core/black hole, but it has no small-scale structure, so it is only visible in NVSS [...]. So it's a #triple of which only part is visible in FIRST."

    ** "This is a beautiful, unusual source. There is another lobe to the lower left, seen in NVSS, but not in FIRST. But then, to the upper right (NW) is an orphaned source, no optical ID, and not clear who it belongs to"

    Last Edit: February 27, 2014, 03:33:37 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    c_cld, February 27, 2014, 03:44:52 pm

    [JeanTate February 26, 2014, 10:08:07 pm]

    My apologies for my first interpretation as noise of your hint of opposite lobe.

    I reprocessed the FIRST cutout fits file and got this image in tweaking by Aladin tool:

    enter image description here

    I agree that the east lobe seems real, probably in a less gas cloud environment than for west lobe.

    The linear distance is ~2.81arcmin i.e. 145.5 kpc at redshift 0.0444 8)

    Last Edit: February 27, 2014, 03:49:12 pm by c_cld

    Posted

  • JeanTate by JeanTate

    NGC3314, March 01, 2014, 02:41:12 pm

    Following this thread with considerable interest - some colleagues set a summer student looking through GZ+radio survey data, and found one plausible spiral with double sources. Zooites are far beyond that already. One possibly helpful point - the FIRST data were taken in a VLA configuration optimized for ~arcsecond resolution and detection of compact sources. Another VLA survey, the NRAO VLA Sky Survey (NVSS), was optimized for larger-scale structures and often shows very extended lobes more clearly. (It is a feature of interferometric imaging that only structures on a certain range of angular scales are shown with high fidelity - large, smooth image components are "resolved out" and can essentially vanish if no further data are available, one reason it's common for the (J)VLA to observe the same target in more than one of its size configurations). NVSS FITS cutouts of a desired sky area can be obtained here.

    Posted

  • JeanTate by JeanTate

    JeanTate, March 02, 2014, 02:50:00 am

    [JeanTate February 26, 2014, 10:08:07 pm]

    Here's just such "an even more zoomed-out composite image" (scale is 0.72"/pix):

    enter image description here

    As HAndernach noted, over in RGZ Talkname, "by the way, the eastern (left) lobe appears like noise in FIRST, only because it's very diffuse; look at NVSS: it is almost as bright"

    Posted

  • JeanTate by JeanTate

    JeanTate, March 02, 2014, 03:51:35 am

    [JeanTate, February 27, 2014, 03:29:41 pm]

    Here is a FIRST+NVSS+SDSS composite, centered on SDSS J120339.20+275537.2, with a scale of 0.72"/pix:

    enter image description here

    Over in RGZ Talk, HAndernach wrote, just a day ago: "SDSS J120339.20+275537.2, z_ph~0.165; size~2.6' (ESE lobe in NVSS, resolved out in FIRST); in Abell 1455, check 1992ApJS...80..501O"

    The paper referred to is "A 20 centimeter VLA survey of Abell clusters of galaxies. II - Images and optical identifications", by Owen et al. (link to ADS entry). Here's the abstract:

    [Owen+ 1992] Radio contour maps, models, and optical identifications for 130 radio galaxies in Abell clusters of galaxies are presented. Results of Gaussian model fits to sources smaller than two beamwidths are presented. The observations were made between 1979 and 1984 using the VLA at 20 cm.

    There's an image of Abell 1455 in that paper - which I'll try to copy and post here later - in which they seem to associate the main radio lobe (in the FIRST + SDSS composite, 0.36"/pix image above) with a different galaxy ... making this plus the "to the upper right (NW) is an orphaned source" a double lobe! 😛

    Posted

  • JeanTate by JeanTate

    c_cld, March 02, 2014, 11:22:53 am

    [JeanTate, March 02, 2014, 03:51:35 am]

    In paper, the two galaxies crossed in between the two lobes are

    SDSS J120336.65+275639.1 1237667323792261365 z=0.140

    SDSS J120336.34+275654.0 1237667323792261366 z=0.139

    The NE steep contours crossed is

    SDSS J120341.63+275957.6 1237667323792326874 z=0.139

    enter image description here

    centered on 1237667323792261366

    Marked

    The north lobe is NVSS 120334+275800 12 03 34.05 +27 58 00.7

    The south lobe is NVSS 120337+275556 12 03 37.55 +27 55 56.1

    The previous guessed spiral 1237667323792327045

    ;D

    NVSS contours:

    enter image description here

    Last Edit: March 02, 2014, 01:37:34 pm by c_cld

    Posted

  • JeanTate by JeanTate

    c_cld, March 02, 2014, 06:24:22 pm

    [JeanTate, February 22, 2014, 12:29:31 am]

    ARG0000b5m
    Known beautiful edgeon NGC 3079 Seyfert_2 10 01 57.80342 +55 40 47.2428 z=0.003766

    1237655108906713101

    enter image description here

    FIRST cutout

    enter image description here

    my composite

    enter image description here

    As the radio is X-shaped (size 1.8' x 50" - PA 245deg x PA 349deg) I think we see two tiny jets-lobes (Z-shaped) above and below the disk 8) 8)

    Last Edit: March 02, 2014, 10:28:07 pm by c_cld

    Posted

  • JeanTate by JeanTate

    zutopian, April 29, 2014, 08:35:04 pm

    New paper:

    Mega parsec relativistic jets launched from an accreting supermassive blackhole in an extreme spiral galaxy

    Here we present the discovery of giant radio source J2345-0449 (z=0.0755), a clear and extremely rare counter example where relativistic jets are ejected from a luminous and massive spiral galaxy on scale of ~1.6 Mpc, the largest known so far.

    Joydeep Bagchi, Vivek M., Vinu Vikram, Ananda Hota, Biju K.G., S. K. Sirothia, Raghunathan Srianand, Gopal-Krishna, Joe Jacob

    (Submitted on 28 Apr 2014)

    http://arxiv.org/abs/1404.6889

    In the paper there is shown an SDSS image and the coordinates are given as follows.:
    "the nucleus of the spiral galaxy at right ascension: 23h 45m 32.71s , declination: −04◦ 49′ 25.32 ′′ (J2000)",

    Here is the SDSS image:

    enter image description here

    http://skyserver.sdss3.org/dr10/en/tools/explore/summary.aspx?id=1237680117958246500

    Last Edit: April 30, 2014, 05:26:02 am by zutopian

    Posted

  • JeanTate by JeanTate

    zutopian, May 01, 2014, 09:49:54 am

    [JeanTate, February 26, 2014, 08:03:50 pm]

    Radio Zoo image:

    http://radiotalk.galaxyzoo.org/#/subjects/ARG00010mw

    Last Edit: May 01, 2014, 09:55:59 am by zutopian

    Posted

  • JeanTate by JeanTate

    zutopian, May 08, 2014, 11:55:37 am

    An Unusual Radio Galaxy in Abell 428: A Large, Powerful FR I Source in a Disk-Dominated Host

    The optical and NIR images clearly show a disk. We detect apparent spiral arms and a dust-lane from B band imaging.

    .

    To the best of our knowledge, this is the first reported detection of a large-scale FR I radio source in an unambiguously disk-dominated host galaxy.

    Michael J. Ledlow (NMSU), Frazer N. Owen (NRAO), William C. Keel (Univ Alabama)

    (Submitted on 22 Sep 1997)

    http://arxiv.org/abs/astro-ph/9709213

    PS: One of the co-authors is Mr Keel !

    Posted

  • JeanTate by JeanTate

    NGC3314, May 09, 2014, 02:22:51 am

    I never even noticed that paper was submitted on my 40th birthday!

    The case for spirality was made even more strongly by later Hubble images, like this ACS composite overlaid with the VLA radio structure:

    enter image description here

    described in

    The Spiral Host Galaxy of the Double Radio Source 0313-192.

    If we could glue together pieces of Galaxy Zoo and Radio Galaxy Zoo... (there has been a bit of messaging across the teams on the value of spiral hosts of giant double radio sources)

    Posted

  • JeanTate by JeanTate

    zutopian, May 09, 2014, 04:20:16 am

    So the paper

    "An Unusual Radio Galaxy in Abell 428: A Large, Powerful FR I Source in a Disk-Dominated Host"

    We report B,R,J, and K imaging, optical spectroscopy, a rotation curve, an IRAS detection, and a VLA 20cm image for this galaxy, 0313-192.

    by Michael J. Ledlow (NMSU), Frazer N. Owen (NRAO), William C. Keel (Univ Alabama)

    http://arxiv.org/abs/astro-ph/9709213

    and the subsequent paper

    "The Spiral Host Galaxy of the Double Radio Source 0313-192"

    We present new Hubble, Gemini-S, and Chandra observations of the radio galaxy 0313-192, which hosts a 350-kpc double source and jets, even though previous data have suggested that it is a spiral galaxy.

    by William C. Keel, Raymond E. White III, Frazer N. Owen, Michael J. Ledlow

    http://arxiv.org/abs/astro-ph/0608086

    are about the same galaxy!

    Curiously, there is a long period of time between the submission dates.: One was submitted 1997 and the other one 2006 !

    Last Edit: May 09, 2014, 06:10:37 am by zutopian

    Posted

  • JeanTate by JeanTate

    JeanTate, June 09, 2014, 04:40:59 pm

    Catch up, and collection. I'll edit/update this post periodically. Current status: I'm working my way through the "not yet rated" candidates, and also checking the ones I'd rated earlier, for consistency. I'll also be editing some of the "images" posts, to provide consistent info (and may add some new images).

    In this post: possible lobe/jet radio source apparently associated with disk galaxies (a.k.a. spirals), as identified independently by zooites, and posted anywhere in RGZ Talk. Together with discoverer, link to discovery RGZ comment/post/thread, and link(s) to nice composite images. Different lists for ratings "excellent", "good", "fair", "poor", "else", and "haven't rated yet". Rating is a WIP (see below)

    Quasi-columns: RGZ ID, SDSS ID, zooite, discovery link (and date of discovery), image(s) link(s), redshift ("ph"= photometric, "sp" = spectroscopic), note (if any); | character as separator. Order is timestamp on discovery comment/post/thread, most recent ones last.

    Excellent (N=8 ... +1 😉)

    • ARG0002fud | SDSS J160458.97+183547.7 | antikodon | discovery (and images) (January 9 2014 6:57 PM) | 0.1222 sp
    • ARG0001zj8 | SDSS J122640.22+253855.5 | WizardHowl | discovery (January 17 2014 3:52 PM) | image | 0.134 sp
    • ARG00036hs | SDSS J132435.81+084635.5 | antikodon | discovery (January 27 2014 8:11 PM) | images | 0.044 sp
    • ARG00022wh | SDSS J112811.63+241746.9 | WizardHowl | discovery (January 30 2014 4:00 PM) | image | 0.169±0.0268, 0.152±0.0563 ph
    • ARG0003o7j | SDSS J022612.45+023307.4 | WizardHowl | discovery (February 25 2014 8:08 PM) | image | 0.145 sp
    • ARG0002whf | SDSS J080259.73+115709.7 | WizardHowl | discovery (March 26 2014 4:10 PM) | image | 0.132±0.0266, 0.141±0.0327 ph
    • ARG00012kb | SDSS J091445.53+413714.3 | zutopian | discovery (May 2 2014 7:58 AM) | image | 0.140 sp
    • ARG0002g0s | SDSS J130140.93+183104.9 | WizardHowl | discoverydiscovery (May 21 2014 3:01 PM) | image | 0.146 sp
    • {plus one! 😉}

    Good (N=7)

    Fair (N=8 ... +2 😉)

    • ARG00021nf | SDSS J083856.31+244701.4 | antikodon | discovery (January 12 2014 6:13 AM) | image | 0.256 ph
    • ARG0002esa | SDSS J140535.56+190612.9 | infobservador | discovery (January 14 2014 9:43 PM) | image | 0.057 sp
    • ARG0000fyb | SDSS J130143.51+525327.2 | antikodon | discovery (January 24 2014 8:44 AM) | image | 0.033 sp
    • ARG000328n | SDSS J124256.34+101305.9 | WizardHowl | discovery (March 6 2014 4:14 PM) | image | 0.249±0.0599, 0.090±0.0394 ph
    • ARG0003jjg | SDSS J212804.10+041738.4 | sharqua | discovery (March 16 2014 4:14 PM) | image | 0.189
    • ARG0000da3 | SDSS J103556.67+542612.5 | JeanTate | discovery (May 21 2014 5:36 PM) | image | 0.351sp
    • ARG00007fk | SDSS J145827.37+580737.2 | JeanTate | discovery (June 10 2014 4:48 PM) | image | 0.285 sp
    • ARG00026v8 | SDSS J141312.26+224313.8 | antikodon | discovery (June 11 2014 11:09 PM) | image | ~0.11 ph
    • {plus two! 😉}

    Poor

    else

    "not yet rated"

    • ARG0002bgv | SDSS J122612.89+204104.6 | JeanTate | discovery (June 3 2014 10:09 AM) | image | ~0.39 ph
    • ARG00001rk | | wpatelunas | discovery (January 1 2014 6:25 PM) | image | ?
    • {plus several others (that when I post they won't be here!) 😉}

    About those criteria: I have just finished writing a post on the background (direct link). I'm going to use a simple two-part test, taken independently/in parallel: is this galaxy

    1. the likely host of the "beyond the optical boundary" radio emission?
    2. not a boring elliptical?

    A candidate is rated "excellent" if the answers are (Yes! Yes!); "good" if (Yes! yes), (yes Yes!), or (yes yes); "fair" if both are at least 'maybe/perhaps' (but is not "excellent" or "good"); "poor" if at least one is 'cannot really tell' (similarly); "else" for all others. Answers ranking: Yes!, yes, maybe/perhaps, cannot really tell, likely not, certainly not.

    In case anyone else would like to work on the objects in my file, I've posted the ARG and (where applicable) SDSS IDs of many of the objects in my file, that I'd classed as "poor" or "else" (the distinction is somewhat arbitrary, for those I posted). As I work though the file, I'll post the rest.

    Anything else to add? Yes; Work on making the criteria for the ratings more objective.

    Please let me know of any mistakes you fell I made, or any corrections, or additions I should make; comments, suggestions: all are welcome! 😃

    '- = + = - - = + = - - = + = - - = + = - - = + = - - = + = - - = + = - - = + = - old stuff - = + = - - = + = - - = + = - - = + = - - = + = - - = + = - - = + = -

    See quote/paste here.

    (to be continued/edited)

    Last Edit: June 17, 2014, 03:38:15 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 09, 2014, 04:47:38 pm

    This post is like the previous one, and I'll likewise update/edit it periodically.

    In this post: possible lobe/jet radio source apparently associated with disk galaxies (a.k.a. spirals), as identified independently by zooites, and first posted other than in RGZ Talk (may be subsequently mentioned in the Hourglass sources associated with spiral galaxies RGZ Talk thread, or not). Together with discoverer, link to discovery (non-RGZ) comment/post/thread, and link(s) to nice composite images. Specifically excluded: reports of such associations previously published, or noted (in the literature for example).

    Quasi-columns: SDSS ID, zooite, discovery link, image(s) link(s), note; | character as separator. Order is as they appear in this thread, then pretty much as I find them.

    It may take quite a while to put together a list in this form ... so I'll just note, for now, candidates (with at least one link to further info):

    • FIRST J084000.8+294838 | SDSS J084002.36+294902.6 | z_sp 0.06484 | Sy2 Sc D. NOT a boring elliptical; see c_cld's post on this, on p1 of this thread (here)
    • (did any zooite notice SPECA independently? before 2011??)
    • SDSS J135217.88+312646.4 1237665331471515679 z spec=0.0452 UGC 08782 , UGC 8782, FIRST J135217.8+312646 , 3C 293.0 , 3C 293. NOT a boring elliptical; c_cld noted the jet/lobe here; the galaxy itself has been posted several times, perhaps earliest by RandyC
    • SDSS J132738.22-020309.9 1237655499200528553 zspec=0.183 4C -01.29. NOT a boring elliptical, and has x-shaped radio emission (per c_cld; did some zooite post it, under its DR7 ID?)
    • SDSS J083752.75+445025.9 1237654653102653683 z spec=0.207 2MASX J08375276+4450255 -- Seyfert 2 Galaxy. Likewise NOT a boring elliptical (see c_cld's post)
    • SDSS J011341.10+010608.5 1237666340800364769 FIRST J011341.1+010609 -- Seyfert 2 Galaxy oiii_5007_flux 2118.05 1237666340800364770 "Winged" and X-Shaped. NOT a boring elliptical (c_cld, quoting a Jan 2012 post of his)
    • SDSS J132318.81+030807.1 1237651737376653585 4C +03.27. NOT a boring elliptical (c_cld)
    • SDSS J023832.67+023349.1 PKS 0236+02 2MASX J02383267+0233496 CXO J023832.6+023349 not a boring elliptical? (my post, quoting TonyWei's)
    • {that's all I've got, so far}

    (to be continued/edited)

    Last Edit: June 14, 2014, 07:33:35 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 10, 2014, 02:13:22 am

    {holding pen, independent discovery of an already known source (?): "One previously known case (NGC 3079) has also turned up: http://radiotalk.galaxyzoo.org/#/subjects/ARG0000b5m"

    also ARG00004w0

    and ARG00010mw - 3C285}

    (to be continued/edited)

    Last Edit: June 12, 2014, 05:50:29 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 10, 2014, 07:27:01 am ARG00018d0 SDSS J164652.71+383845.3 (zutopian)

    [JeanTate, June 09, 2014, 04:40:59 pm] ARG00018d0 | SDSS J164652.71+383845.3 | zutopian | discovery (June 9 2014 8:58 AM) | | ~0.2 ph

    The disk galaxy - an Eos (edge-on spiral) or at least a highly inclined one, possibly an early-type (Sa?) - is in the center of this SDSS DR10 image, which is 100"x100" (500x500 pix @ 0.2"/pix):

    enter image description here

    Per Aladin's pre-packaged 'SDSS9 colored' background with FIRST emission displayed as contours on top:

    enter image description here

    So this may be a core (SMBH in the nucleus of the host galaxy, the Eos) plus a single lobe (i.e. a one-sided FRII source); or the host (galaxy hosting the SMBH) may be the faint smudge, SDSS J164652.14+383839.9, and the alignment with the edge-on disk galaxy mere chance:

    enter image description here

    I recently downloaded Aladin Sky Atlas, and have started using it in "Aladin on your machine" mode.

    Posted

  • JeanTate by JeanTate

    JeanTate, June 10, 2014, 10:28:09 am ARG00027yg SDSS J170525.98+221617.9 (WizardHowl)

    [JeanTate, June 09, 2014, 04:40:59 pm] ARG00027yg | SDSS J170525.98+221617.9 | WizardHowl | discovery (January 20 2014 7:56 PM) | | 0.048 sp

    SDSS J170525.98+221617.9, the nice face-on spiral in the center:

    enter image description here

    Here is a composite with FIRST, in red (a fair bit of image processing, so it's more artist than scientific):

    enter image description here

    As it's nigh on impossible to find anything in Talk, here's what's been posted about this candidate (in RGZ Talk):

    WizardHowl: "spiral with spectrum of elliptical?"

    Ivywong: "@kevinschawinski and I had a look at the spiral's spectrum below and we agree that it's fairly normal one for an old dusty spiral. some hints of optical AGN activity in the lines but [oiii] and Hb lines are too weak to tell"

    WizardHowl: "The host [...] seems to be SDSS J170525.98+221617.9 Z_sp=0.048 a smooth spiral but with a spectrum more closely resembling an elliptical. Maybe it could be an elliptical that has been disturbed by an encounter (with the larger elliptical next door that also is a radio source) and now has a spiral shape? If so then it is not a 'true' spiral but the recent blog post about red spirals found in Galaxy Zoo Hubble suggests that the view of which galaxies may really be disks may be changing anyway, which will impact radio classifications... (discussion for another day...)"

    A couple of additional composites:

    enter image description here

    enter image description here

    June 12, 2014, 09:02:16 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 10, 2014, 01:15:33 pm ARG0002j29 SDSS J135817.73+171236.7 & J135818.74+171300.6 (WizardHowl)

    [JeanTate, June 09, 2014, 04:40:59 pm]

    • ARG0002j29 | SDSS J135817.73+171236.7 | WizardHowl | discovery (January 21 2014 6:46 PM) | | 0.095 sp
    • ARG0002j29 | SDSS J135818.74+171300.6 | WizardHowl | discovery (January 21 2014 6:46 PM) | | 0.095 sp

    SDSS J135817.73+171236.7 in the center; SDSS J135818.74+171300.6 in upper-left quadrant.

    enter image description here

    composite with FIRST, in red (a fair bit of image processing - different from the last one - and it's more artist than scientific):

    enter image description here

    WizardHowl: "2 spiral galaxies with hourglass emission or corejets at Z_sp=0.095 EoS SDSS J135817.73+171236.7 barred spiral SDSS J135818.74+171300.6"

    [WizardHowl] Today I also found two candidates and am adding them to this thread to keep track of them - they are both in the same image and at the same redshift of Z_sp=0.095, so their morphology is clearer and their spectra cleaner:

    http://radiotalk.galaxyzoo.org/#/subjects/ARG0002j29

    almost edge-on disk SDSS J135817.73+171236.7

    barred spiral SDSS J135818.74+171300.6

    The barred spiral has much weaker emission that barely generates a contour and both seem to be corejets, although it is also possible that the stronger source is a triple and the barred galaxy just has weak activity near its core; the orientation makes it ambiguous and without seeing detail in the jets the triple scenario is more likely as it invokes only one source rather than two.

    UPDATE: I'm revisiting the objects I'd posted earlier, with a view to applying the two criteria consistently.

    Start with the DR10 image, scale 0.18"/pix, 108"x108", centered on the "almost edge-on disk SDSS J135817.73+171236.7"

    enter image description here

    One galaxy is certainly not a boring elliptical, but the other? Stay tuned.

    SkyView composite, DR7 SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 8 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? For the galaxy in the center, check; for the other one? "maybe" at best, but more likely "can't really tell"

    Is this galaxy in the center the likely host of the radio emission? Yes! What about the other one? Well, it has nuclear radio activity ...

    For the barred spiral, then, poor.

    Applying the same ellipticity and inverse concentration ratio (c) tests as I introduced with ARG0000da3 (see this post), "almost edge-on disk SDSS J135817.73+171236.7" is an E4 elliptical, with c below the threshold value (0.385) in all bands (except u, but the error for petroR90_u is off the scale). Subjectively, I'd class it as an elliptical. So, poor.

    Last Edit: June 16, 2014, 03:27:28 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 10, 2014, 04:23:21 pm

    I'm about to make some major edits to the post I'm quoting - which I'm using to record what 'very strange spirals' zooites have found, in RGZ - and I want to preserve a copy of where I had gotten up to before I start to make those edits.

    [JeanTate, June 09, 2014, 04:40:59 pm] Catch up, and collection. I'll edit/update this post periodically. Current status: first pass at collecting all candidates done (includes IDs, discoverer/timestamp/link, and redshift). Some loose ends to be tidied up. Images already posted in RGZ Talk to be added in this thread, one per candidate.

    In this post: possible lobe/jet radio source apparently associated with disk galaxies (a.k.a. spirals), as identified independently by zooites, and posted in the Hourglass sources associated with spiral galaxies RGZ Talk thread. Together with discoverer, link to discovery RGZ comment/post/thread, and link(s) to nice composite images.

    Quasi-columns: RGZ ID, SDSS ID, zooite, discovery link (and date of discovery), image(s) link(s), redshift ("ph"= photometric, "sp" = spectroscopic), note (if any); | character as separator. Order is per appearance in the RGZ thread (which, of course, may not be the order of discovery) ETA: now that I have all the timestamps, I may have re-ordered this by date/time (almost).

    • ARG0001uiz | SDSS J120339.20+275537.2 | WizardHowl | discovery (January 6 2014 12:45 PM) | images | ~0.165 ph
    • ARG0002fud | SDSS J160458.97+183547.7 | antikodon | discovery (and images) (January 9 2014 6:57 PM) | 0.1222 sp
    • ARG0003qg8 | SDSS J112526.53+014301.5 | firejuggler | discovery (January 10 2014 7:16 PM) | | 0.434 sp
    • ARG0002esa | SDSS J140535.56+190612.9 | infobservador | discovery (January 14 2014 9:43 PM) | image | 0.057 sp
    • ARG0002zck | SDSS J154336.07+110512.9 | infobservador | discovery (January 14 2014 10:38 PM) | images | 0.084 sp
    • ARG0001zj8 | SDSS J122640.22+253855.5 | WizardHowl | discovery (January 17 2014 3:52 PM) | image | 0.134 sp
    • ARG00007yo | SDSS J083136.46+574545.9 | WizardHowl | discovery | | unlikely
    • ARG00027yg | SDSS J170525.98+221617.9 | WizardHowl | discovery (January 20 2014 7:56 PM) | image | 0.048 sp
    • ARG0002j29 | SDSS J135817.73+171236.7 | WizardHowl | discovery (January 21 2014 6:46 PM) | image | 0.095 sp
    • ARG0002j29 | SDSS J135818.74+171300.6 | WizardHowl | discovery (January 21 2014 6:46 PM) | image | 0.095 sp
    • ARG00036hs | SDSS J132435.81+084635.5 | antikodon | discovery (January 27 2014 8:11 PM) | images | 0.044 sp
    • ARG00022wh | SDSS J112811.63+241746.9 | WizardHowl | discovery (January 30 2014 4:00 PM) | image | ~0.16 ph
    • ARG0002y6c | SDSS J080217.94+112535.0 | WizardHowl | discovery (January 31 2014 5:09 PM) | | 0.060 sp
    • ARG0002ozz | SDSS J144039.86+144122.6 | WizardHowl | discovery (February 21 2014 7:18 PM) | | ~0.08 ph
    • ARG0001kwr | SDSS J121659.93+323106.0 | WizardHowl | discovery (February 23 2014 2:01 PM) | | 0.125 sp
    • ARG00028nb | SDSS J142305.86+215735.5 | WizardHowl | discovery (February 24 2014 1:01 PM) | | ~0.13 ph
    • ARG0003o7j | SDSS J022612.45+023307.4 | WizardHowl | discovery (February 25 2014 8:08 PM) | | 0.145 sp
    • ARG0000x3e | SDSS J092132.98+441345.2 | c_cld | discovery (March 1 2014 9:28 PM) | | 0.247 sp | 4C 44.18
    • ARG0002oyw | SDSS J104434.63+144204.0 | c_cld | discovery (March 2 2014 3:26 PM) | | 0.155 sp | DR8/9 ObjId 1237661070863761563
    • ARG000328n | SDSS J124256.34+101305.9 | WizardHowl | discovery (March 6 2014 4:14 PM) | | ~0.17 ph
    • ARG0003jjg | SDSS J212804.10+041738.4 | sharqua | discovery (March 16 2014 4:14 PM) | | ?
    • ARG0002whf | SDSS J080259.73+115709.7 | WizardHowl | discovery (March 26 2014 4:10 PM) | | ~0.13 ph
    • ARG0000css | SDSS J102733.29+544227.9 | WizardHowl | discovery (April 2 2014 5:52 PM) | | ~0.26 ph
    • ARG00012kb | SDSS J091445.53+413714.3 | zutopian | discovery (May 2 2014 7:58 AM) | | ?
    • ARG0000qmw | SDSS J101536.14+472044.1 | Jean Tate | discovery (May 6 2014 7:58 PM) | | ~0.2 ph
    • ARG0002g0s | SDSS J130140.93+183104.9 | WizardHowl | discovery (May 21 2014 3:01 PM) | | 0.146 sp
    • ARG00025v9 | SDSS J120110.64+230519.2 | antikodon | discovery (June 6 2014 12:35 AM) | image | 0.049 sp
    • ARG00018d0 | SDSS J164652.71+383845.3 | zutopian | discovery (June 9 2014 8:58 AM) | image | ~0.2 ph

    Anything else to add?

    Please let me know of any mistakes you fell I made, or any corrections, or additions I should make; comments, suggestions: all are welcome! 😃

    (to be continued/edited)

    Posted

  • JeanTate by JeanTate

    JeanTate, June 12, 2014, 12:32:55 pm ARG0002y6c SDSS J080217.94+112535.0 (WizardHowl)

    [JeanTate, June 09, 2014, 04:40:59 pm] ARG0002y6c | SDSS J080217.94+112535.0 | WizardHowl | discovery (January 31 2014 5:09 PM) | | 0.060 sp

    The galaxy is in the center of this DR10 cutout, 126"x122" (526x510 pix @0.24"/pix):

    enter image description here

    Per Aladin's pre-packaged 'SDSS9 colored' background with FIRST emission displayed as contours on top:

    enter image description here

    The association - galaxy/radio emission - seems excellent; and the galaxy seems to have a dustlane, or possibly stubby arms (or does it?). But what sort of radio emission is it, corejet? And is the fainter emission - to the SW - real? associated with the galaxy?

    UPDATE: A SkyView composite, SDSS DR7 r-band (DR10 wouldn't load, strange) with FIRST contours (0 min, 3 levels, contour smoothing 8 ) and a DR10 image (108"x108", 600x600 pix @0.18"/pix):

    enter image description here

    Is this galaxy (still) not a boring elliptical? yes

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (possible corejet, hint of a detached lobe?)? yes

    good

    Last Edit: June 17, 2014, 08:51:46 am by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 12, 2014, 12:59:30 pm ARG0002ozz SDSS J144039.86+144122.6 (WizardHowl)

    [JeanTate, June 09, 2014, 04:40:59 pm] ARG0002ozz | SDSS J144039.86+144122.6 | WizardHowl | discovery (February 21 2014 7:18 PM) | | ~0.08 ph

    The "galaxy" (it's actually a blue STAR) is in the center of this DR10 cutout, 121"x117" (526x510 pix @0.23"/pix):

    enter image description here

    Per Aladin's pre-packaged 'SDSS9 colored' background with FIRST emission displayed as contours on top:

    enter image description here

    Whatever the host galaxy is, which is producing this nice hourglass emission, it is not a local spiral. 😦

    Last Edit: June 12, 2014, 01:46:15 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 12, 2014, 01:31:40 pm ARG0002nfj SDSS J105743.81+151740.3 (zutopian)

    [JeanTate June 09, 2014, 04:40:59 pm] ARG0002nfj | SDSS J105743.81+151740.3 | zutopian | discovery (May 8 2014 2:47 PM) | image | ~0.076 ph | similarities with objects featured in DocR's Remarkable Discoveries Underway – Citizen Scientists fire up Radio Galaxy Zoo blog post

    The galaxy - an inclined white spiral with brilliant white nucleus - is in the center of this DR10 cutout, 121"x117" (526x510 pix @0.23"/pix):

    enter image description here

    Per Aladin's pre-packaged 'SDSS9 colored' background with FIRST emission displayed as contours on top:

    enter image description here

    The NW bent triple (a "wat", wide-angle tail) - "Starship Enterprise" 😉 - has the ETG ("elliptical") z_ph ~0.243 SDSS J105742.10+151804.1 as its host.

    The NE radio source, the nucleus of the disturbed spiral z_sp=0.037 SDSS J105744.80+151826.8 is typical of spirals (fairly weak radio emission, confined to the nuclear region).

    The central source is the ETG z_sp=0.222 SDSS J105743.38+151748.9. Chance alignment? Both white spiral and z=0.222 elliptical are unrelated sources? Spiral is radio quiet, and just happens to lie in the apparent path of the (far in the background) nascent jet from the super-massive black hole in the elliptical?

    Oh, and why "Starship Enterprise"? Judge for yourself! ;D

    enter image description here

    UPDATE: SkyView composite, SDSS DR7 r-band (DR10 wouldn't load, strange) with FIRST contours (0 min, 10 levels, contour smoothing 8 ) and DR10 image (108"x108" (600x600 pix @0.18"/pix)):

    enter image description here

    Is this galaxy - the white spiral with the dazzling AGN - the likely host of the radio emission? Of the nuclear emission, certainly. Of any of the radio emission which extends well beyond the optical boundary? I'm going for "can't really tell".

    poor.

    Last Edit: June 17, 2014, 01:50:36 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 12, 2014, 02:03:43 pm ARG0001pl7 SDSS J161358.61+301809.4 (antikodon)

    [JeanTate June 09, 2014, 04:40:59 pm] ARG0001pl7 | SDSS J161358.61+301809.4 | antikodon | discovery (May 22 2014 1:07 AM) | image | ~0.105 ph

    The galaxy - small inclined white disk - is in the center of this DR10 cutout, 174"x168" (526x510 pix @0.33"/pix):

    enter image description here

    Per Aladin's pre-packaged 'SDSS9 colored' background with FIRST emission displayed as contours on top:

    enter image description here

    Perhaps the host is one of the faint z_ph ~0.66 red splodges, such as SDSS J161358.01+301812.3?

    enter image description here

    That would make this double lobe a real giant! 😛

    Later, I'll add a composite with the FIRST emission in red ...

    Now is later: The galaxy is in the center of this DR10 cutout, 216"x2116" (600x600 pix @0.36"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? Yes!

    SkyView composite, FIRST, in red, with contours (0 min, 9 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (doublelobe)? yes.

    Good 😃

    Last Edit: June 16, 2014, 09:17:42 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 12, 2014, 02:26:13 pm ARG0001kwr SDSS J121659.93+323106.0 (WizardHowl)

    [JeanTate, June 09, 2014, 04:40:59 pm] ARG0001kwr | SDSS J121659.93+323106.0 | WizardHowl | discovery (February 23 2014 2:01 PM) | | 0.125 sp

    The galaxy is in the center of this DR10 cutout, 121"x117" (526x510 pix @0.23"/pix):

    enter image description here

    Per Aladin's pre-packaged 'SDSS9 colored' background with FIRST emission displayed as contours on top:

    enter image description here

    No doubt about the association. Nor that the galaxy has an AGN; here's the spectrum:

    enter image description here

    But is it a disk galaxy? ???

    Posted

  • JeanTate by JeanTate

    JeanTate, June 12, 2014, 02:40:57 pm ARG00028nb SDSS J142305.86+215735.5 (WizardHowl)

    [JeanTate, June 09, 2014, 04:40:59 pm] ARG00028nb | SDSS J142305.86+215735.5 | WizardHowl | discovery (February24 2014 1:01 PM) | | ~0.13 ph

    The galaxy is in the center of this DR10 cutout, 121"x117" (526x510 pix @0.23"/pix):

    enter image description here

    Per Aladin's pre-packaged 'SDSS9 colored' background with FIRST emission displayed as contours on top:

    enter image description here

    Yes, it's very likely the host, and the radio emission extends far beyond the optical boundary (at least in this SDSS image) ... but is it a disk galaxy? ??? Zooming in a bit:

    enter image description here

    What do you think?

    Posted

  • JeanTate by JeanTate

    JeanTate, June 12, 2014, 06:03:54 pm About 3C 285...

    [JeanTate February 26, 2014, 08:03:50 pm]

    The existence of a disk in 3C 285 (the host galaxy of the radio emission) has been known for quite a while.

    In one of its main outputs, NED provides a list, with columns like "Object Name", "Object Type", "Velocity/Redshift", ... and "Refs", and "Notes".

    For 3C285, there are (today) 203 Refs 8) 😮 and 6 Notes. All six are worth copy/pasting here (my added bold):

    [from 1] Re:3C 285

    A14. 3C 285 - Ours is the first X-ray spectrum to be measured for the nucleus of this source. A two-component model with absorbed and unabsorbed power laws and a strong Gaussian component with rest-frame energy 6.42+/-0.05 keV are required, although the data are not good enough to constrain the photon indices of the power-law components.

    (2006MNRAS.370.1893H)

    .

    [from 2] Re:3C 285

    Irregular clumps of emission linked to star formation are detected in the ultraviolet image of this galaxy (Allen et al. 2002). The near-infrared image shows a flattened galaxy elongated southeast to northwest. The dust lane perpendicular to the elongation of the galaxy is visible in both the WFPC2 and NICMOS images. A faint arclike source is present approximately 5.1" to the southeast; see zoom image.

    (2006ApJS..164..307M)

    .

    [from 3] Re:3C 285

    3C285.-Figure 18 shows the optical and UV images of 3C 285. This galaxy has a very chaotic morphology, with multiple large- and small-scale irregular dust lanes. There appears to be two main dust systems which are elongated perpendicular to one another. The smaller system, aligned roughly along P.A. = 5deg, obscures the nucleus. The larger system aligned along P.A. = 330deg intersects the smaller system at about 2" distance from the nucleus and defines a large ridge of extinction which crosses the entire PC chip (Fig. 18h). The UV image reveals clumps of emission which are predominantly located along the edges of both the small and large-scale dust lanes. These clumps are suggestive of star formation along the edges of dust lanes. Faint diffuse emission is also detected in the UV image, and the dust lanes are apparent in a smoothed version of the image.

    (2002ApJS..139..411A)

    .

    [from 4] Re:3C 285

    5.4 3C 285
    The host galaxy of 3C 285 has been identified with the brightest member of a group of galaxies (Sandage 1972). Optical imaging of the galaxy reveals an elliptical main body and a distorted S-shaped envelope aligned with a companion galaxy ~40 arcsec to the north-west (Heckman et al. 1986). Narrow-band imaging shows that the S-shaped extension is the result of continuum-emitting structures (Heckman et al. 1986; Baum et al. 1988). The narrow emission lines are originated by photoionization with a high-ionization parameter (Saunders et al. 1989; Baum et al. 1992). Sandage (1972) found that the B - V colour of 3C 285 is much bluer than that of a normal elliptical galaxy. Our observations show that the blue light of the nucleus (inner 2 arcsec) is dominated by a burst which contains A2I stars, and thus has an age of 10-12 Myr. Saslaw, Tyson & Crane (1978) identified a bright blue slightly resolved object halfway between the nucleus and the eastern radio lobe, which they denoted 3C 285/09.6. Optical spectra and imaging obtained by van Breugel & Dey (1993) showed that the knot is at the same redshift as the galaxy, and its UBV colours and 4000-A break are consistent with a burst of 70 Myr, which they interpreted as being induced by the radio jet. 3C 285 is a classical double-lobed radio galaxy of 190 arcsec total extension at 4.86 GHz, with two hotspots and an eastern ridge showing curvature roughly along the line to the optical companion (Leahy & Williams 1984; Hardcastle et al. 1998). The source has not been detected by the Einstein satellite in X-rays, at a flux level f(0.5-3 keV) < 1.5 x 10^-13^ erg cm^-2^ s^-1^ or L_X_ = 4.4 x 10^42^ erg s^-1^ (Fabbiano et al. 1984).

    (2001MNRAS.325..636A)

    .

    [from 5] Re:3C 285

    5.3 3C 285 (z=0.0794)

    This relatively blue galaxy appears in both passbands to be a nucleated disc interacting with a less luminous (V = 17.36 mag) and slightly redder (U - V = 1.37) neighbour (G2), 39.9 arcsec away at PA -249 (Fig. 6). Both galaxies show tidal distortion of their outer isophotes. The galaxy is mildly asymmetric in the V band and more obviously so in the U band, where the nucleus is less prominent but appears to lie within a large (radius ~ 3-4 arcsec, ~ 6-8 kpc), off-centre ring structure (Fig. 7). Baum et al. (1988) found radio-axis aligned H{alpha} emission extending ~ 5.5 arcsec either side of the nucleus, but this is not visible in our images. We do detect a known hotspot (H1) with V = 20.64 mag and U - V = 0.39, 48.2 arcsec from 3C 285 at PA 840, which is within the east radio lobe. It is less blue than our starburst model (U - V = -0.50), but this can be explained by post-starburst reddening. Van Breugel & Dey (1993) previously confirmed that H1 is at the radio galaxy redshift and best fitted its spectrum with an instantaneous starburst model at an age 0.07 +/- 0.03 Gyr. They concluded that it is a kpc-sized object in which star formation had been triggered by the earlier passage of the radio jet.

    (2000MNRAS.317..120R)

    .

    [from 6] Re:3C 285

    3C 285.--This elliptical galaxy has a peculiar optical morphology (Heckman et al. 1986). It displays dramatic isophotal twisting and has a blue color but a red nucleus (Smith 1988). It also has an S-shaped emission-line gas running due east-west along the direction of the radio axis (Baum et al. 1988). Van Breugel & Dey (1993) report the presence of a blue star-forming region in the eastern lobe of 3C 285. This region is apparently elongated along the radio source axis, and its optical line emission, and possibly its optical continuum emission, appear to be edge-brightened on the side facing the nucleus. Van Breugel & Dey suggest that the star formation in this region is triggered by the passage of the radio lobe the intergalactic medium. The UV image of the F342W filter shows the southeastern part of the galaxy. It appears to have a high ellipticity and no nuclear UV component. It matches the optical image (F702W) reasonably well, which implies that the extended UV emission is due to starlight. The F702W image also shows a disklike structure.

    (1998ApJS..114..177Z)

    So, RGZ zooites finding that the host of 3C 285 - an obvious double-lobe radio galaxy - has dust lanes, a disk, and generally looks quite different from an elliptical galaxy is an independent (re)discovery, not anything new.

    It may be that when professional astronomers refer to just a handful (two, three) of spirals having hourglass or doublelobe radio morphologies, they are excluding 3C 285. Kinda an important consideration for our search ... what, exactly, do professional astronomers mean?

    Last Edit: June 12, 2014, 06:15:18 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 13, 2014, 01:08:40 am ARG0002whf SDSS J080259.73+115709.7 (WizardHowl)

    [Jean Tate June 09, 2014, 04:40:59 pm] ARG0002whf | SDSS J080259.73+115709.7 | WizardHowl | discovery (March26 2014 4:10 PM) | | ~0.13 ph

    The galaxy is in the center of this DR10 cutout, 108"x108" (500x500 pix @0.216"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? Yes!

    SkyView composite, SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 6 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (a nice, albeit asymmetric hourglass + hint of a core)? Yes!

    Excellent! 8)

    Last Edit: June 13, 2014, 09:58:38 am by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 13, 2014, 07:26:25 am

    Here's the OP (opening post) of the RGZ Talk thread, Hourglass sources associated with spiral galaxies:

    [raynorris] Keep an eye out for any #hourglass sources that seem to be hosted by galaxies that look spiral in the infrared. These objects are incredibly rare in the local Universe (only 2 or 3 known) and we may not see any in Radio Galaxy Zoo, but if someone does find one, that would be worth writing a paper about (with the discoverer as co-author, of course). The rarity of radio-loud spirals is thought to be because the radio jets heat up and disrupt the gas in the spiral, switching off star formation, and turning the galaxy into a "red dead" elliptical. But we might find one or two where the jets have only just switched on and haven't yet destroyed the spiral. See http://adsabs.harvard.edu/abs/2012MNRAS.422.1453N for another example of this process in its very early stage. So keep your eyes peeled and yell out (very loudly) if you find one!

    I'm quoting this because it's about the best place I can think of to try to write some criteria for a) deciding if an RGZ object may be the kind of thing we're looking out for here, and b) what scientific merit such objects might have. Here's the abstract of that paper:

    [Norris+ 2012] F00183-7111 is one of the most extreme ultraluminous infrared galaxies known, with a bolometric luminosity of 9 × 1012 Lsol. Here we present a very long baseline interferometry (VLBI)_ image which shows a compact core-jet active galactic nucleus (AGN) in its core, with a radio luminosity (L2.3 GHz= 6 × 1025 W Hz-1) typical of powerful radio galaxies. Although already radio loud, the quasar jets are only 1.7 kpc long, boring through the dense gas and starburst activity that confine them. This source therefore appears to be powered by a combination of a compact radio-loud AGN surrounded by vigorous starburst activity.

    That the textbook perfect Sb and Sc spiral galaxies, with their blue arms and disks, do not have radio jets, lobes, giant plumes, ... nor x-ray or optical jets, nor ... is well-established. And this is so whether or not such galaxies have AGNs (e.g. Seyferts), even when such AGNs are blindingly bright (i.e. when the host galaxy of a quasar - radio-loud or not - is a spiral).

    So maybe this is because such perfect spirals have so much gas and dust that even though jets get started near the accretion disk around the SMBH (super-massive black hole), they simply go nowhere.

    If that's the hypothesis, then the following sorts of objects would be well worth finding, to study in detail, to test the hypothesis (no particular order):

    • irregulars with jet(s)/lobe(s)/plume(s): irregulars do not have SMBH, so how could they produce jets etc?
    • red spirals with doublelobes (shorthand for 'jet(s)/lobe(s)/plume(s)//etc'): red spirals seem to lack gas and dust (at least, they have far less of it than ordinary, blue, spirals), but some still have AGNs, so they should have more doublelobes
    • lenticulars with doublelobes: lenticulars are just red spirals without arms, bars, or rings
    • Eos (edge-on spirals) with doublelobes: perhaps jets can 'break out' more easily if they shoot perpendicular (or nearly so) to the disk plane? And if accretion disks have random orientations with respect to the disk plane, the distribution of Eos doublelobe orientations can test this idea
    • dwarf galaxies with doublelobes: like irregulars, dwarf galaxies do not have SMBH, so how could they produce doublelobes?
    • 'dustlane' galaxies with doublelobes: dust is thought to have a very short life, except in dense molecular clouds; if there's obviously copious quantities of dust and also doublelobes, does that mean there are no molecular clouds? or that jets can punch through dust but not gas?
    • {interested readers: please add your own questions! 😃}

    So a first-pass criterion for selecting 'spirals with doublelobes', in order for them to be used to test various hypotheses concerning AGNs and jets, might be something like "any galaxy other than a boring elliptical which seems to have radio emission outside the optical boundary, or extending beyond that boundary". The "seems to have" can be graded, with symmetric triples where the core coincides perfectly with the nucleus being A+, to a faint blob of radio emission far from the galaxy (and no other radio emission) D (or even F?). How to decide if a likely host galaxy is 'a boring elliptical' or not? The usual zooite method (but blue ellipticals as hosts are definitely to be noted! they likely contain gas and dust), plus astronomers' tests (e.g. concentration ratio, color, Sérsic profile index).

    In short, a simple two-part test, taken independently/in parallel: is this galaxy

    1. the likely host of the radio emission?
    2. not a boring elliptical?

    This thread seems to have had a lot of readers lately, and not just me with my endless edits and new posts. How about some of you readers write a post or two? What do you think of all the stuff I've been posting this last week?

    Last Edit: June 13, 2014, 08:10:03 am by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 13, 2014, 09:27:34 am ARG0003o7j SDSS J022612.45+023307.4 (WizardHowl)

    [JeanTate June 09, 2014, 04:40:59 pm] ARG0003o7j | SDSS J022612.45+023307.4 | WizardHowl | discovery (February 25 2014 8:08 PM) | | 0.145 sp

    The galaxy is in the center of this DR10 cutout, 108"x108" (500x500 pix @0.216"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? Yes!

    SkyView composite, SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 6 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (a nice, not-quite symmetric hourglass)? Yes!

    Excellent! 8)

    Last Edit: June 13, 2014, 09:59:45 am by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 13, 2014, 09:48:21 am ARG00012kb SDSS J091445.53+413714.3 (zutopian)

    [JeanTate June 09, 2014, 04:40:59 pm] ARG00012kb | SDSS J091445.53+413714.3 | zutopian | discovery (May 2 2014 7:58 AM) | | 0.14 sp

    The galaxy is in the center of this DR10 cutout, 108"x108" (500x500 pix @0.216"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? Yes!

    SkyView composite, SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 10 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (a nice, not-quite symmetric doublelobe, plus core)? Yes!

    Excellent! 8)

    Last Edit: June 13, 2014, 10:00:55 am by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 13, 2014, 01:13:58 pm ARG0002g0s SDSS J130140.93+183104.9 (WizardHowl)

    [JeanTate June 09, 2014, 04:40:59 pm] ARG0002g0s | SDSS J130140.93+183104.9 | WizardHowl | discovery (May 21 2014 3:01 PM) | | 0.146 sp

    The galaxy is in the center of this DR10 cutout, 108"x108" (500x500 pix @0.216"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? Yes!

    SkyView composite, SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 6 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (corejet morphology, hint of faded lobe on the opposite side)? Yes!

    Excellent! 8)

    Posted

  • JeanTate by JeanTate

    JeanTate, June 13, 2014, 01:42:59 pm ARG000328n SDSS J124256.34+101305.9 (WizardHowl)

    [JeanTate June 09, 2014, 04:40:59 pm] ARG000328n | SDSS J124256.34+101305.9 | WizardHowl | discovery (March 6 2014 4:14 PM) | | 0.249±0.0599, 0.090±0.0394 ph

    The galaxy is in the center of this DR10 cutout, 72"x72" (500x500 pix @0.144"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? yes

    SkyView composite, SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 10 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (almost symmetric hourglass morphology, lobes of unequal brightness)? ah, that'd be a "maybe", or perhaps a "perhaps"

    fair

    Posted

  • JeanTate by JeanTate

    planetaryscience, June 13, 2014, 01:44:48 pm Re: ARG0002whf SDSS J080259.73+115709.7 (WizardHowl)

    [JeanTate June 13, 2014, 01:08:40 am]

    As an unrelated side note, that blue-ish object at the top right appears to have some radio emission coming from it. Is it possibly a quasar or something?

    Posted

  • JeanTate by JeanTate

    JeanTate, June 13, 2014, 03:19:03 pm ARG0003gfp SDSS J103959.58+052049.3 (antikodon)

    [JeanTate June 09, 2014, 04:40:59 pm] ARG0003gfp | SDSS J103959.58+052049.3 | antikodon | discovery (January 23 2014 10:18 PM) | image | ~0.22 ph

    The galaxy is in the center of this DR10 cutout, 72"x72" (500x500 pix @0.144"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? Yes!

    SkyView composite, SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 6 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (symmetric hourglass morphology, lobes of somewhat unequal brightness)? That'd be a "pretty unlikely"

    How about of the fairly bright, compact radio emission? Can't really tell.

    else, or poor (at best)

    Posted

  • JeanTate by JeanTate

    JeanTate, June 13, 2014, 06:19:25 pm Re: ARG0002whf SDSS J080259.73+115709.7 (WizardHowl)

    [planetaryscience on June 13, 2014, 01:44:48 pm] [snip]

    As an unrelated side note, that blue-ish object at the top right appears to have some radio emission coming from it. Is it possibly a quasar or something?

    I'm certainly a long way from being able to confidently produce fully meaningful contour maps, from FIRST data; however, the 'smallest value' contours can - generally - be safely taken as just noise. Sometimes there'll be a pattern of something suggestive, which a different analysis - or different data - will show is real (this post, by c_cld, earlier in this thread, is just such an example).

    If the blue-ish object has colors typical of quasars (or better, a spectrum showing that it is just that), the radio contour might be interesting. If you don't already know, would you like to learn how to get some - possibly relevant - data from SkyView, or Aladin? 😃

    Posted

  • JeanTate by JeanTate

    JeanTate, June 13, 2014, 08:09:44 pm

    Another snapshot, to preserve a record of where the main post - with all the details, and summary of progress etc - was, at the time I quoted this ...

    [JeanTate June 09, 2014, 04:40:59 pm]

    Another significant revision planned (or at least thought about)? Yep! 😃

    Posted

  • JeanTate by JeanTate

    zutopian, June 14, 2014, 05:59:47 am

    Title: Large Radio Sources Hosted by Spiral Galaxies (aka: The Wrong Type of Host!)

    Authors: Duffin, Ryan; Mao, M.; Owen, F. N.

    Affiliation: AA(National Radio Astronomy Observatory; University of Virginia), AB(National Radio Astronomy Observatory), AC(National Radio Astronomy Observatory)

    Publication: American Astronomical Society, AAS Meeting #223, #250.21

    Publication Date: 01/2014

    Origin: AAS

    Abstract Copyright: (c) 2014: American Astronomical Society

    Bibliographic Code: 2014AAS...22325021D

    http://adsabs.harvard.edu/abs/2014AAS...22325021D

    They started a project to search for further spirals with jets and they found as 1st candidate SDSS J164924.01+263502.6 .:

    enter image description here

    http://skyserver.sdss3.org/dr9/en/tools/explore/obj.asp?id=1237662301913940522

    Last Edit: June 14, 2014, 06:23:54 am by zutopian

    Posted

  • JeanTate by JeanTate

    JeanTate, June 14, 2014, 01:51:33 pm

    Cool! 8)

    Here's the abstract:

    [Duffin+] In the local Universe, double-lobed, powerful radio sources are almost always hosted by elliptical galaxies, and those hosted by spiral galaxies are extremely rare. To date, only one, 0313-192, has been confirmed (Ledlow et al. 2001; Keel et al. 2006). 0313-192’s host galaxy is an edge-on spiral confirmed to be the source of the double-lobed radio emissions. A number of possible factors have been proposed to explain this occurrence, including extrinsic environmental factors, an unusually luminous bulge in the spiral galaxy, and prior minor merger activity. Other candidate spiral galaxies hosting double-lobed radio sources have been identified, but none as convincingly as 0313-192. Many of these candidates have been shown to be misclassified ellipticals or chance alignments, including the famous example of PKS 0400-181 (Shaver et al. 1983). In an attempt to further our understanding of spiral galaxies that host double-lobed radio sources, we began a project to search for more of these enigmatic sources and estimate a number density to describe their occurrence. During the course of this research, a second spiral galaxy that appears to be hosting a double-lobed radio source was identified, J164924.01+263502.6.

    I wonder if this what NGC3314 was referring to (upthread, p2)?

    [NGC3314, March 01, 2014, 02:41:12 pm] Following this thread with considerable interest - some colleagues set a summer student looking through GZ+radio survey data, and found one plausible spiral with double sources. Zooites are far beyond that already.

    Here's what it looks like (DR10 cutout, 216"x216" (600x600 pix @0.36"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? Yes!

    And SkyView composite, SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 6 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    I dunno, do you think any of the eight "excellent" objects (plus one you haven't seen yet 😃 ) are as convincing as this? Even more convincing? ;D

    Last Edit: June 15, 2014, 04:28:02 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    zutopian, June 14, 2014, 02:30:18 pm

    Great work! Thanks, Jean !

    Could you please give a score to/rate the excellent candidates and maybe also the good ones respectively? Which ones are most convincing ?

    Besides I would like, that you create an image of the spiral galaxy 1237680117958246500, which was presented in a new paper. I informed about the paper in a reply to this topic.

    Last Edit: June 14, 2014, 02:47:31 pm by zutopian

    Posted

  • JeanTate by JeanTate

    zutopian, June 14, 2014, 06:52:55 pm

    [NGC3314 March 01, 2014, 02:41:12 pm] Following this thread with considerable interest - some colleagues set a summer student looking through GZ+radio survey data, and found one plausible spiral with double sources. Zooites are far beyond that already. (...)

    Jean guessed, that it might be 1237662301913940522 aka SDSS J164924.01+263502.6 , whose discovery was recently announced at a AAS Meeting.:

    Title: Large Radio Sources Hosted by Spiral Galaxies (aka: The Wrong Type of Host!)

    Authors: Duffin, Ryan; Mao, M.; Owen, F. N.

    Affiliation: AA(National Radio Astronomy Observatory; University of Virginia), AB(National Radio Astronomy Observatory), AC(National Radio Astronomy Observatory)

    Publication: American Astronomical Society, AAS Meeting #223, #250.21

    Publication Date: 01/2014

    Origin: AAS

    Abstract Copyright: (c) 2014: American Astronomical Society

    Bibliographic Code: 2014AAS...22325021D

    http://adsabs.harvard.edu/abs/2014AAS...22325021D

    Well, I speculate, that he didn't refer to that one, but I wonder, if it corresponds one of the discoveries by zooites ?

    Last Edit: June 14, 2014, 07:11:19 pm by zutopian

    Posted

  • JeanTate by JeanTate

    JeanTate, June 15, 2014, 04:09:14 pm ARG0003jjg SDSS J212804.10+041738.4 (sharqua)

    [JeanTate June 09, 2014, 04:40:59 pm] ARG0003jjg | SDSS J212804.10+041738.4 | sharqua | discovery (March 16 2014 4:14 PM) | | 0.189 sp

    Here's what it looks like (DR10 cutout, 108"x108" (600x600 pix @0.18"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? Um, say what? "this" galaxy is the one in the center, the one that looks most like a boring elliptical (if you ignore all the stuff around it). Every other galaxy is NOT a boring elliptical. So that's a resounding "yes" (but you may have a different opinion).

    And SkyView composite, SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 12 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Well, it certainly extends beyond the boundary of some galaxy (no matter which one); so check.

    Is this galaxy the likely host of the radio emission? Huh? What, exactly, is that radio emission?!? #wat? #bent? #triple? Whatever it is, it's at least a "maybe".

    Fair. But surely worth following up on, whether it turns out that a non-boring elliptical is the host or not! ;D

    Last Edit: June 15, 2014, 04:31:40 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 15, 2014, 04:26:59 pm ARG0000css SDSS J102733.29+544227.9 (WizardHowl)

    [JeanTate June 09, 2014, 04:40:59 pm] ARG0000css | SDSS J102733.29+544227.9 | WizardHowl | discovery (April 2 2014 5:52 PM) | | ~0.26 ph

    Here's what it looks like (DR10 cutout, 108"x108" (600x600 pix @0.18"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? yes

    And SkyView composite, SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 9 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (symmetric hourglass morphology, lobes of somewhat unequal brightness)? Yes!

    Good 😃

    Posted

  • JeanTate by JeanTate

    JeanTate, June 15, 2014, 05:33:45 pm ARG0000da3 SDSS J103556.67+542612.5 (JeanTate)

    ARG0000da3 | SDSS J103556.67+542612.5 | JeanTate | discovery (May 21 2014 5:36 PM) | 0.351sp

    Here's what it looks like (DR10 cutout, 216"x216" (600x600 pix @0.36"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? maybe, perhaps 😮 Let me explain ... (later, at the bottom of this post)

    And SkyView composite, SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 12 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (triple, with symmetric double lobe morphology, a possible giant, lobes of somewhat unequal brightness)? Yes!

    fair

    Here's a zoomed in, processed1 image of the galaxy itself:

    enter image description here

    Doesn't look like a boring elliptical to me, too much structure.

    In the g-band, this galaxy has an 'ellipticity' of 4, consistent with being a giant elliptical2. On the other hand, the g-band inverse concentration index is 0.415, consistent with it being a disk galaxy3. In the r-band, the ellipticity is 2, and the inverse concentration ratio 0.386. This pattern - smaller ellipticity, smaller inverse concentration ratio - is what you expect of a disk galaxy, because they tend to be bluer on the outside.

    So, is this galaxy a boring elliptical? A definite "maybe" ...

    1 I applied a Gaussian blur, then 'posterized' it; I have found that this two-step image processing often makes much clearer what I can make out, with difficulty, in the original. Of course, this is not a rigorously scientific approach (but 'posterizing' does produce something somewhat resembling isophotes)

    2 'ellipticity' here means INT(10*(1-axis ratio)), a measure of how 'out of round' ellipticals are; there are no E5 (E6, ...) giant ellipticals. Values for the axis ratio come from the SDSS photometric pipeline, and are available by clicking on the "PhotoObj" link in the Explore view.

    3 Strateva et al., 2001, and Shimasaku et al., 2001; this ratio is petroR90/petroR50, the radius which contains 90% and 50% of the Petrosian flux, respectively

    Last Edit: June 16, 2014, 12:34:13 pm by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 16, 2014, 08:37:05 am ARG0000qmw SDSS J101536.14+472044.1 (JeanTate)

    [JeanTate June 09, 2014, 04:40:59 pm] ARG0000qmw | SDSS J101536.14+472044.1 | JeanTate | discovery (May 6 2014 7:58 PM) | | ~0.2 ph

    Here's what it looks like (DR10 cutout, 108"x108" (600x600 pix @0.18"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? yes

    And SkyView composite, SDSS r-band (faded to all-but invisibility) with FIRST contours (0 min, 6 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Well, it is beyond the boundary of the two galaxies nearby ...

    Is this galaxy the likely host of the radio emission (symmetric double lobe morphology)? No.

    else 😦

    Posted

  • JeanTate by JeanTate

    JeanTate, June 16, 2014, 09:17:02 am ARG00001rk ? (wpatelunas)

    ARG00001rk | | wpatelunas | discovery (January 1 2014 6:25 PM) | | ?

    This is outside the SDSS footprint, and there's no galaxy between the two lobes (SkyView composite, DSS2 Red with FIRST contours (0 min, 6 levels, contour smoothing 8 )):

    enter image description here

    In WISE Band 1 it is skewered by a diffspike, but looks a lot like there's an edge-on spiral at a position close to the center of the two lobes. So, some follow-up has been done, but the result is inconclusive (DSS2 Red does not go very deep). Perhaps if someone could make a good composite with WISE Band 1 and FIRST contours ... ?

    Last Edit: June 16, 2014, 09:19:30 am by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 16, 2014, 09:42:11 am ARG0000fyb SDSS J130143.51+525327.2 (antikodon)

    ARG0000fyb | SDSS J130143.51+525327.2 | antikodon | discovery (January24 2014 8:44 AM) | 0.033 sp

    Here's what it looks like (DR10 cutout, 216"x216" (600x600 pix @0.36"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? Yes!

    And SkyView composite, SDSS DR7 r-band (DR10 wouldn't load, strange) with FIRST contours (0 min, 4 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (possible doublelobe - NW one is weak - with odd SE plume)? It's not really in the center, so it could just be a chance alignment. A definite "maybe"! 😛

    fair

    Posted

  • JeanTate by JeanTate

    JeanTate, June 16, 2014, 12:32:33 pm ARG00026v8 SDSS J141312.26+224313.8 (antikodon)

    ARG00026v8 | SDSS J141312.26+224313.8 | antikodon | discovery (June 11 2014 11:09 PM) | | ~0.11 ph

    Here's what it looks like (DR10 cutout, 216"x216" (600x600 pix @0.36"/pix); the candidate host is the small, almost 'vertical' blue 'flat' galaxy (a bulgeless Eos?):

    enter image description here

    Is this galaxy not a boring elliptical? Yes!

    And SkyView composite, SDSS DR7 r-band (DR10 wouldn't load, strange) with FIRST contours (0 min, 6 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (doublelobe, lobes of unequal brightness)? It's not really in the center, so it could just be a chance alignment. A definite "maybe"! 😛

    fair

    Posted

  • JeanTate by JeanTate

    JeanTate, June 16, 2014, 01:42:22 pm NGC 7479

    NGC 7479 is a galaxy quite a few RGZ zooites have commented on, and well before them, plenty of GZ zooites too. Not hard to understand why (DR10 cutout, 324"x324" (600x600 pix @0.54"/pix)):

    enter image description here

    Is this galaxy not a boring elliptical? Yes! :😃

    And SkyView composite, FIRST, in red, with contours (0 min, 6 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Apply our test blindly: Radio emission is/extends beyond optical boundary of galaxy? Um, .... no ... but then the image doesn't really go beyond the optical boundary, so how would we know?

    Is this galaxy the likely host of the radio emission (whatever it is)? Yes!

    Nuclear radio emission is quite common in spirals - nuclear starbursts, mildly active AGNs, ... - and relatively faint radio emission also not uncommon elsewhere in the disk, due to supernovae remnants, regions of intense star-formation, etc. Because NGC 7479 is so large - on the sky - due to it being so close to us (z=0.00794), radio emission that would otherwise be so faint as to be just noise can be clearly detected in FIRST, and seen as extended. Nonetheless, the superb parallel processor which is our brain wants to see a pattern in the radio emission (mine says there's a sorta line, N to S, trending E), so what if we zoom out (scale 1.8"/pix; image is 18'x18')?

    enter image description here

    And make a SkyView composite, using NVSS this time, in cyan, with contours (0 min, 14 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Hmm, I'm gonna let a radio astronomer comment on this ... yes, there is an intense (count those contours!) NVSS radio source which is at the same location as NGC 7479, but as in the above FIRST image, the radio emission isn't really strong at all. With a handful of exceptions, outside the galaxy, the radio sources are weak ... if there were doublelobes etc, they'd be really intense! But maybe NGC 7479 does have radio jets/lobes, only they're really faint? ???

    Anyway, I'm classing this as an else. 😛

    Posted

  • JeanTate by JeanTate

    NGC3314, June 16, 2014, 08:32:42 pm

    (re SDSS J164924.01+263502.6)

    [JeanTate June 14, 2014, 01:51:33 pm] I wonder if this what NGC3314 was referring to (upthread, p2)?

    Yes, that's the one I knew about from their work. I missed the AAS abstract naming it.

    Posted

  • JeanTate by JeanTate

    JeanTate, June 17, 2014, 02:39:37 pm ARG00007fk SDSS J145827.37+580737.2 (JeanTate)

    [JeanTate June 09, 2014, 04:40:59 pm] ARG00007fk | SDSS J145827.37+580737.2 | JeanTate | discovery (June 10 2014 4:48 PM) | image | 0.285 sp

    Here's what it looks like (DR10 cutout, 216"x216" (600x600 pix @0.36"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? yes

    And SkyView composite, SDSS DR7 r-band (DR10 wouldn't load, strange) with FIRST contours (0 min, 6 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (whatever it is, double lobe? corejet+single lobe?)? It could just be a chance alignment. A definite "maybe"! 😛

    fair

    Posted

  • JeanTate by JeanTate

    JeanTate, June 17, 2014, 02:58:47 pm ARG00021nf SDSS J083856.31+244701.4 (antikodon)

    ARG00021nf | SDSS J083856.31+244701.4 | antikodon | discovery (January 12 2014 6:13 AM) | 0.256 ph

    Here's what it looks like (DR10 cutout, 324"x324" (600x600 pix @0.54"/pix):

    enter image description here

    And a close-up of the galaxy:

    enter image description here

    Is this galaxy not a boring elliptical? Yes!

    And SkyView composite, SDSS DR7 r-band (DR10 wouldn't load, strange) with FIRST contours in red (0 min, 12 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (a giant doublelobe, lobes of unequal brightness)? It's not really in the center, so it could just be a chance alignment. A definite "maybe"! 😛

    fair

    Last Edit: June 18, 2014, 02:40:03 am by JeanTate

    Posted

  • JeanTate by JeanTate

    planetaryscience, June 17, 2014, 03:05:30 pm

    enter image description here

    1237657775532737024 SDSS

    NVSS

    FIRST

    RGZ

    WISE

    How exactly do I do the overlap thing?

    Posted

  • JeanTate by JeanTate

    JeanTate, June 17, 2014, 03:34:18 pm ARG0001zrc SDSS J125611.77+253156.5 (zutopian)

    ARG0001zrc | SDSS J125611.77+253156.5 | zutopian | discovery (April26 2014 6:58 PM) | ~0.29 ph

    Here's what it looks like (DR10 cutout, 108"x108" (600x600 pix @0.18"/pix):

    enter image description here

    Is this galaxy not a boring elliptical? Yes!

    And SkyView composite, SDSS DR7 r-band (DR10 wouldn't load, strange) with FIRST contours (0 min, 12 levels, contour smoothing 8 ) and above DR10 image:

    enter image description here

    Radio emission is/extends beyond optical boundary of galaxy? Check.

    Is this galaxy the likely host of the radio emission (a one-sided jet/lobe)? Can't really tell.

    poor

    Last Edit: June 18, 2014, 02:41:22 am by JeanTate

    Posted

  • JeanTate by JeanTate

    JeanTate, June 17, 2014, 04:07:37 pm

    [planetaryscience June 17, 2014, 03:05:30 pm] How exactly do I do the overlap thing?

    Back on page 1 of this thread:

    [JeanTate February 26, 2014, 08:15:33 pm]

    [JeanTate February 21, 2014, 03:12:33 pm] 3 Unfortunately, I don't seem to be able to make composite SDSS/radio images 😢

    Over in the Radio source thread:

    [planetaryscience February 24, 2014, 03:32:09 pm] may I just ask: Where is everyone getting these images from?

    [c_cld c_cld on February 24, 2014, 03:42:36 pm] Superposition image is my manual work of stacking images from

    SDSS DR10 Chart tool

    and

    Extract FIRST Image Cutouts

    😛

    This is my chance to publicly thank c_cld for posting the link to Stega, and, more importantly, to helping me work out how to create composite/superposition/overlay images! 8) 😗

    My source for WISE and FIRST images is NASA's SkyView; I use the SkyView Query Form to obtain black-n-white JPG files, 500x500 pix in size, and with a 'plate scale' the same as that of the SDSS DR10 image I plan to use. Of course, it's important to make sure that the (RA, Dec) of the center of the images is the same! 😛 I then process the JPG images with GIMP (I'm sure any decent image processing tool would work just as well), upload to Photobucket (and there are plenty of other such web-based services), ...

    While I did try using Aladin Sky Atlas (the desktop version, "Aladin on your machine"), I found it too restrictive.

    I use the SkyView Query Form. I have a DR10 Object Explore page open, centered on the object I want (usually the galaxy); this gives me the coordinates (I use "Decimal"), which I simply copy/paste into SkyView. I select SDSSr (or SDSSdr7r if that doesn't work), pixel size 600, Image Size 0.03 (typically, or 0.06, sometimes others), Contour Overlays "VLA FIRST (1.4 GHz)", Scaling "Linear", and the other values I post for each. Click "Submit" (I check the "Display results in new window" box). Left click on the image, save the image to my machine.

    For the 'canvass' I left-click on the DR10 Explore image, and copy/paste the image URL into the gap between the [ i m g ] and [ / i m g ] tags here (the "Insert Image" icon gives you these). I then edit the URL to change the scale and image size, and remove the grid. Click "Preview" mode, and left-click on the image, to save it to my machine.

    With GIMP open (I'm sure other good image processing apps work much the same way), I open the SkyView image, change the Levels (to leave only the contours and the brightest parts of some stars and galaxies), CTRL-C; then open the DR10 image, and paste the SkyView image in as a New Layer. Adjust the opacity, merge down, save, upload to Photobucket, and Done! 😛

    It was incredibly slow the first time (and I made LOTS of mistakes), and sometimes I have to adjust the contour settings (to get contours that exclude noise), and/or the image size (to get everything I want in).

    For composites with FIRST and/or NVSS data as red or cyan splotches, it's the FIRST (NVSS) SkyView Survey that I select, not an SDSS one (and I may not do contours). GIMP processing involves turning white to red (or cyan), leveling (to remove noise) and blurring (to get rid of the pixellation, especially important for NVSS images). Opacity setting is more challenging for these, especially if I want both FIRST and NVSS...

    Hope this helps! ;D

    My next challenge is to write my own program (or obtain and/or modify an existing one) to produce scientifically meaningful contours and set a threshold (to make noise go away), starting with the actual FIRST (or NVSS) data (i.e. FITS files). Sorta like how RGZ produces Radio and contour overlays ... 😉

    Posted

  • JeanTate by JeanTate

    planetaryscience, June 17, 2014, 05:19:25 pm

    Thanks Jean. 😉

    Here's my first:

    enter image description here

    2MASX J12494224+3038373 Black & white scale (I'm working on doing the color thing) showing 'bent' radio source.

    I'm going to do some experimenting around with these to see if any others look good.

    Unfortunately, the only image-editing application that I have is MS-paint which wouldn't do simple tasks like that to save my life. 😛

    Last Edit: June 17, 2014, 05:22:04 pm by planetaryscience

    Posted

  • JeanTate by JeanTate

    JeanTate, June 17, 2014, 06:59:38 pm

    Good start planetaryscience! 8) ;D

    I would definitely recommend that you invest some time - no need for money - in looking into image processing programs/apps/etc.

    While I like GIMP, it is certainly not the only good (free) one available (for Windows, in my case). And once you've got one, spend a good few hours learning how it works, it will be time very well spent. 😉

    Posted

  • JeanTate by JeanTate

    planetaryscience, June 17, 2014, 10:11:04 pm

    2MASX J12184985+5026170

    enter image description here

    I'm looking into possible options for programs like that.

    Posted

  • JeanTate by JeanTate

    zutopian, June 18, 2014, 07:41:20 am

    [zutopian April 29, 2014, 08:35:04 pm]

    I started a discussion in Radio Zoo Talk related to the discovery/paper, which I mentioned in my above post.:

    http://radiotalk.galaxyzoo.org/#/boards/BRG0000003/discussions/DRG00006nz

    Posted

  • JeanTate by JeanTate

    zutopian, June 18, 2014, 07:50:51 am

    [zutopian June 14, 2014, 02:30:18 pm] (...)

    Besides I would like, that you create an image of the spiral galaxy 1237680117958246500, which was presented in a new paper. I informed about the paper in a reply to this topic.

    I used SkyView to create images with contours of the above galaxy.

    Thanks for the instructions, Jean! I am not able to create coloured SDSS images with contours, but just basic images, which I posted in Radio Zoo Talk.:

    http://radiotalk.galaxyzoo.org/#/boards/BRG0000003/discussions/DRG00006nz

    PS: I would like to have the option to select the "coloured SDSS survey" in SkyView !!!

    Posted

  • JeanTate by JeanTate

    JeanTate, June 18, 2014, 09:50:36 am

    Cool! 8) ;D

    You might like to try Aladin first, before trying to download and manipulate images on your own machine, using an image processing app. Among other things, Aladin lets you start with "SDSS9 colored" as your background (canvass). And it has various image processing tools like you'd find in GIMP (at least, the 'on your machine' version does), so you can learn how to do stuff in the one system. Also, if you're more comfortable in French than English, there's a French version.

    @planetaryscience: neither of these are spirals, are they? Perhaps they'd be more at home in the Radio source thread?

    Posted

  • JeanTate by JeanTate

    JeanTate, June 18, 2014, 06:09:44 pm

    [NGC3314 June 16, 2014, 08:32:42 pm] (re SDSS J164924.01+263502.6)

    [JeanTate June 14, 2014, 01:51:33 pm] I wonder if this what NGC3314 was referring to (upthread, p2)?

    Yes, that's the one I knew about from their work. I missed the AAS abstract naming it.

    Thanks! 😃

    Posted

  • JeanTate by JeanTate

    JeanTate, June 18, 2014, 06:17:08 pm

    Copy of a post I wrote, in the RGZ Talk thread Hourglass sources associated with spiral galaxies:

    [raynorris] These objects are incredibly rare in the local Universe (only 2 or 3 known) ...

    I've been trying to track down these "2 or 3"; here's what I have found:

    • 0313-192 (Ledlow+ 1997, and Keel+ 2006)
    • NGC 5548 (Liu+ 2002? likely earlier, but I can't find any)
    • SDSS J084002.36+294902.6/FIRST J084000.8+294838 (Liu+ 2002? likely earlier, but I can't find any)
    • SDSS J140948.85-030232.5 (Hota+ 2011; Speca, "[it] could possibly be the second spiral-host large radio galaxy", presumably after 0313-192)
    • 3C 285 (I don't know)
    • ARG00004w0, per HAndernach
    • J2345-0449 (Bagchi+ 2014, after the OP was written)
    • SDSS J164924.01+263502.6 (Duffin+ 2014*, ditto)

    I'm not sure if NGC 3079 (ARG0000b5m) should be included or not. By my criterion of "radio emission extends beyond the optical boundary" it would not ...

    Rather more than two or three ... 😦

    *"During the course of this research, a second spiral galaxy that appears to be hosting a double-lobed radio source was identified" Hmm, that's at least the second second 😄

    Posted

  • JeanTate by JeanTate

    JeanTate, June 18, 2014, 06:22:42 pm

    And another one:

    I'm going to take a bit of a break from creating composite images and trying to classify the candidates I've found in RGZ Talk so far*, so I can spend some time learning how to use Python to do analyses of the candidates (see this post for some background etc). I'll still be looking at new comments, and collecting possible candidates.

    Here are some 'as of now' stats, which may be of interest:

    • 97 records in my file, one record per potential candidate (but see below!)
    • 9 are duplicates, independent discoveries, errors, etc
    • excluding the 9, 78 records were collected before I first posted my intentions in this thread, and ten since

    Of the 78:

    • 8 are "excellent" (one has yet to be posted in the GZ forum thread)
    • 7 are "good"
    • 10 are "fair" (two have yet to be posted in the GZ forum thread)
    • 23 "poor"
    • 21 "else"
    • 9 "yet to be rated"

    Most of these 9 "yet to be rated" are complicated, for one reason or another; most are likely to end up being either "poor" or "else".

    More intensive searching could turn up another ~20 candidates, among comments posted before ~10 June. Very roughly, then, ~15 candidates per month.

    Of the ten candidates I've noted since 10 June, I've rated just one (and posted it to the GZ forum thread), ARG00026v8. If the distribution is ~the same as among the 78, another 2 or 3 of these ten will be excellent/good/fair. The 'rate of discovery' is about the same, perhaps a tad higher.

    How many excellent/good/fair might there be, among those no one has commented on yet? I cannot answer that, but maybe a scientist could ... How to factor in the 'zooite'? Here's the number of candidates by zooite, ignoring their 'hit rate' among candidates (and counting independent discoveries - two or more zooites independently find the same candidate - just once):

    • 24 WizardHowl
    • 20 antikodon
    • 16 zutopian
    • 7 JeanTate (surely biased! 😮)
    • 3 firejuggler
    • 2 each: c_cld, Dolorous Edd, inforservador
    • 1 each: bartinhogoool, Brucea, Emmabray, jesse.rehm, mdwilber, Milkybear, planetaryscience, SG1966, sharqua, teamaynard, Ushiromiya Xyrius

    Oh, and we need just a fifth (or even less?) of the 25 excellent/good/fair objects to turn out to be the real thing, in order to double the current known number of these systems. 😮 How cool is that?!? 😄

    *to be very clear: almost all these were discovered by zooites other than JeanTate

    Posted

  • JeanTate by JeanTate

    zutopian, June 19, 2014, 06:30:40 am

    [JeanTate June 18, 2014, 06:17:08 pm]

    Here is a further paper.:

    WISE J233237.05-505643.5: a Double-Peaked Broad-Lined AGN with Spiral-Shaped Radio Morphology

    (...) Unlike most FR-II objects, W2332-5056 is hosted by a disk-like galaxy. (...)

    Chao-Wei Tsai, Thomas H. Jarrett, Daniel Stern, Emonts Bjorn, R. Scott Barrows, Roberto J. Assef, Ray P. Norris, Peter R. M. Eisenhardt, Carol J. Lonsdale, Andrew W. Blain, Dominic J. Benford, Jingwen Wu, Brian Stalder, Christopher W. Stubbs, F. William High, K. L. Li, Albert K. H.Kong

    (Submitted on 8 Oct 2013)

    http://arxiv.org/abs/1310.2257

    In this paper there are mentioned further cases, e.g. following ones.:

    • disk-like galaxy PKS 1814-636 (Morganti et al. 2011)
    • NGC 612 (Ekers et al. 1978). This one is also mentioned in the paper by Keel et al.
    • and further ones

    Last Edit: June 19, 2014, 08:07:43 am by zutopian

    Posted

  • JeanTate by JeanTate

    zutopian, June 19, 2014, 03:24:12 pm

    NGC 5972 has shown up in Radio Zoo Talk.:

    http://radiotalk.galaxyzoo.org/#/subjects/ARG0002jh9

    Talk discussion:NGC 5972: Galaxy with known voorwerpje and known doublelobe

    http://radiotalk.galaxyzoo.org/#/boards/BRG0000002/discussions/DRG00006oe

    I did following post in Radio Zoo Talk.:

    enter image description here

    http://skyserver.sdss3.org/public/en/tools/explore/summary.aspx?id=1237665566615666691

    It is NGC 5972, which has a known voorwerpje (ionized gas cloud). Ref.: GZ paper by Keel et al..
    One of the other NED Refs is as follows.:.

    Title: The Hubble type of the double lobe radio galaxy NGC 5972

    We found in the literature a single example of a spiral galaxy associated with a classical extended double lobe radio source: NGC 5972 classified as an S0-a by Lauberts (1982). We show that it is rather an E galaxy which may possibly be the result of a merger event. It has an emission line spectrum typical of a Seyfert 2 galaxy.

    Authors: Veron, P.; Veron-Cetty, M.-P.

    Publication: Astronomy and Astrophysics, v.296, p.315 (A&A Homepage)

    Publication Date: 04/1995

    Origin: CDS; KNUDSEN

    Bibliographic Code: 1995A&A...296..315V

    http://adsabs.harvard.edu/cgi-bin/bib_query?1995A%26A...296..315V

    The paper was cited in following paper.:

    Title: An Unusual Radio Galaxy in Abell 428: A Large, Powerful FR I Source in a Disk-dominated Host

    Authors: Ledlow, Michael J.; Owen, Frazer N.; Keel, William C.

    Bibliographic Code: 1998ApJ...495..227L

    http://adsabs.harvard.edu/abs/1998ApJ...495..227L

    Here is the GZ blog post about the observation by the HST.:

    Something rich and strange – Hubble eyes NGC 5972

    (...)This is a galaxy with active nucleus, large double radio source, and the most extensive ionized gas we turned up in the Voorwerpje project. (...)

    http://blog.galaxyzoo.org/2012/07/12/something-rich-and-strange-hubble-eyes-ngc-5972/

    Last Edit: June 19, 2014, 06:22:34 pm by zutopian

    Posted

  • JeanTate by JeanTate

    zutopian, June 19, 2014, 05:12:08 pm

    Referring to my previous post:

    Curiously, NGC 5972 is classified just as S0/a* in NED! :

    There are following 3 Refs for the morphology.:

    Curiously, the paper 1995A&A...296..315V isn't listed as Ref. for the morphology! As mentioned in previous post, according to the paper "The Hubble type of the double lobe radio galaxy NGC 5972" it is an elliptical ! Curiously, the paper by Lauberts (1982) is also not listed as Ref. for the morphology class in NED.

    Title: The Hubble type of the double lobe radio galaxy NGC 5972

    We found in the literature a single example of a spiral galaxy associated with a classical extended double lobe radio source: NGC 5972 classified as an S0-a by Lauberts (1982). We show that it is rather an E galaxy which may possibly be the result of a merger event. It has an emission line spectrum typical of a Seyfert 2 galaxy.

    Authors: Veron, P.; Veron-Cetty, M.-P.

    Publication: Astronomy and Astrophysics, v.296, p.315 (A&A Homepage)

    Publication Date: 04/1995

    Origin: CDS; KNUDSEN

    Bibliographic Code: 1995A&A...296..315V

    http://adsabs.harvard.edu/cgi-bin/bib_query?1995A%26A...296..315V

    *Lenticular/Spiral transition type, Hubble stage between S0 and Sa.

    Last Edit: June 19, 2014, 05:14:24 pm by zutopian

    Posted

  • JeanTate by JeanTate

    zutopian, June 19, 2014, 05:58:18 pm

    [zutopian June 19, 2014, 05:12:08 pm] Referring to my previous post:

    Curiously, NGC 5972 is classified just as S0/a* in NED! :

    (...)

    In the GZ voorwerpje paper the morphology of NGC 5972 is given as follows.:

    Table 9: Morphologies of AGN hosts with extended clouds:
    SDSS designation z Sy type Name rmax, kpc Morphology cone angle disc/cloud angle Sides
    (...)
    SDSS J153854.16+170134.2 0.0297 2 NGC 5972 33 Warped disc and tails 35 18 2
    (...)

    http://arxiv.org/abs/1110.6921

    Last Edit: June 19, 2014, 06:16:58 pm by zutopian

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  • JeanTate by JeanTate

    zutopian, June 20, 2014, 10:07:12 am

    Concerning NGC 5972 :

    Jean did following new post in Radio Zoo Talk ^:

    Very cool, zutopian! 😄

    A nearby object which may connect EELRs (a.k.a. voorwerpjes) with radio lobes/jets with disk galaxies, and merger activity and a quenching of star-formation, all in one object ... how cool would that be?!? Not to mention that zooites played an important role ...

    I did following reply.:

    Well, it is unclear to me, if is an elliptical or a disc galaxy.: In the Veron et al.paper it is stated, that it is actually an elliptical, but in the voorwerpje paper it is classified however as a disc. I wonder, if the HST observation, which was done later, is useful to clarify the morphology? When will the paper about the voorwerpje observations by the HST be available?

    In the GZ forum Mr Keel had written in the introduction of the topic "Hubble and Voorwerpjes"^^ following.:

    NGC 5972 attracted some interest as possibly being a spiral with a giant double-lobed radio source, which would be quite rare. In a study published in 1995, Phillippe Veron and Mira Veron-Cetty showed that the "spiral arms" are filaments of gas ionized by the central AGN, whose motions are mostly smooth rotation about the core.

    After the observation by the HST, c_cld did following comment.:

    May be you could already confirm the tentative conclusion of this 1995 paper:
    "The analysis of the images of NGC 5972 shows that it is an E galaxy rather than an SO-a; this galaxy however shows some structures which are not identifiable with spiral arms but could perhaps be the result of a merger event."

    Would NGC 5972 be a polar ring candidate?

    Mr Keel replied as follows.:

    I think we entirely support the idea that NGC 5972 has undergone a merger - we see tidal streams, and the dust and gas are in multiple planes and twisted. It might end up as a polar ring, if we are really patient.

    So in addition "Polar ring galaxy formation", which is also interesting ! 😃

    ^ http://radiotalk.galaxyzoo.org/#/boards/BRG0000002/discussions/DRG00006oe

    ^^ http://www.galaxyzooforum.org/index.php?topic=279219.msg610041#msg610041

    June 20, 2014, 10:09:58 am by zutopian

    Posted

  • JeanTate by JeanTate

    zutopian, June 20, 2014, 10:37:07 am

    Jean did following post in Radio Zoo Talk today.:

    There's a paper just out which may help us a lot: A Catalogue of Two-Dimensional Photometric Decompositions in the SDSS-DR7 Spectroscopic Main Galaxy Sample: Preferred Models and Systematics, Meert+ 2014:
    (...)
    By getting the results of these 2D model fits, for candidate hosts in SDSS DR7, we would (will) have a more objective basis for classifying the host's optical morphology, and hopefully enough data to formulate hypotheses concerning late-type vs early-type, signs of merger/interaction, and may even be able to extrapolate to better classifications of more distant/fainter candidate hosts.

    And when raynorris returns, he can tells us how any of this relates to PRONGS! 😃

    http://radiotalk.galaxyzoo.org/#/boards/BRG0000003/discussions/DRG00000rz

    She had informed about this paper also in a new GZ forum topic, which she had started.:

    "A Catalogue of Two-Dimensional Photometric Decompositions in the SDSS-DR7 ..."

    http://www.galaxyzooforum.org/index.php?topic=281916.0

    I am not sure, if the catalog helps to distinguish between elliptical and disc galaxy.

    Last Edit: June 20, 2014, 01:51:55 pm by zutopian

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  • JeanTate by JeanTate

    zutopian, June 23, 2014, 03:41:43 pm

    CHANG-ES III: UGC10288 -- An Edge-on Galaxy with a Background Double-lobed Radio Source

    A surprising new result is the presence of a strong, polarized, double-lobed extragalactic radio source ({\it CHANG-ES A}) almost immediately behind the galaxy and perpendicular to its disk.

    Judith Irwin, Marita Krause, Jayanne English, Rainer Beck, Eric Murphy, Theresa Wiegert, George Heald, Rene Walterbos, Richard J. Rand, Troy Porter

    (Submitted on 14 Nov 2013)

    http://arxiv.org/abs/1311.3894

    Posted

  • JeanTate by JeanTate

    JeanTate, June 28, 2014, 10:36:49 pm

    [JeanTate February 26, 2014, 10:08:07 pm]

    Sadly, I think a more quantitative analysis suggests the host of the nice doublelobes is some invisible (in the SDSS image) far-in-the-background galaxy! 😢

    Consider this:

    enter image description here

    FIRST contours are in red (threshold 3 sigma, scaling sqrt(2); little smoothing), and NVSS in cyan (threshold 3 sigma, scaling sqrt(2); heavy smoothing). To me, the nucleus of the nice z_sp = 0.044 spiral is not at the center. More details on page 2 of the RGZ Talk thread How to decide the 'zero point' for radio contours?

    Posted