Radio Galaxy Zoo Talk

ARG000298g BLUE GALAXY ARC is it a artifact? is it a image copy of SDSS J144623.68+214238.7 a blue galaxy?

  • 1001G by 1001G

    Z 0.571 SDSS J144623.68+214238.7 1237665567683576062 1RXS J144624.5+214302 BLUE GALAXY NORTH LOOKS LIKE THE BLUE GALAXY IMAGE NEXT TO z 0.101 SDSS J144625.28+214139.7. IS IT? Has the gravity curvature of space from z 0.101 SDSS J144625.28+214139.7 produced SDSS J144623.68+214238.7 the blue galaxy image copy next to SDSS J144625.28+214139.7?
    See SIMBAD for clear images

    enter image description here enter image description here

    enter image description here

    Posted

  • JeanTate by JeanTate in response to 1001G's comment.

    This is a very cool field, nice find 1001G! 😃

    enter image description here

    There seem to be three different, somewhat overlapping, radio hosts: a compact, a twin corejet, and a doublelobe. The first two are essentially invisible in the NVSS data, and the host of the doublelobe not a distinct radio souce. My interpretation:

    enter image description here z_sp 0.112 SDSS J144625.12+214209.8, compact host

    enter image description here z_ph 0.18 SDSS J144625.63+214156.0 host of (NVSS/FIRST) doublelobe

    enter image description here z_ph 0.10 SDSS J144625.28+214139.7 host of the twin corejet, the E arm of which almost spears the blue arc

    What's the nature of the blue arc? I have no idea! 😮

    The image in this post was created from sources, and using methods, described in this RGZ Talk post. The object at the center of the image is SDSS J144625.28+214139.7

    Posted

  • 42jkb by 42jkb scientist, admin

    To be honest, I have no idea! At first I thought it looked like another galaxy in the foreground. However, it lies right where the FIRST radio jet stops (although that could be a resolution and sensitivity issue). There appears to be two radio sources and may be in a group.

    Posted

  • Dolorous_Edd by Dolorous_Edd

    What's the nature of the blue arc? I have no idea!

    Without highter resolution optical images this all just plain guess work

    It may or may not be a lens or just galaxy

    Posted

  • zutopian by zutopian in response to 42jkb's comment.

    To be honest, I have no idea! At first I thought it looked like another galaxy in the foreground. However, it lies right where the FIRST radio jet stops (although that could be a resolution and sensitivity issue). There appears to be two radio sources and may be in a group.

    I speculate, that it might be an object like Minkowski's Object*, especially because it apparently lies right where the FIRST radio jet stops!
    Could the scientists please take a spectrum?

    '* Curiously, there is no wikipedia article available about Minkowski's Object, which had been discovered by the astronomer Rudolph Minkowski. There is a wikipedia article available about him, but the famous "Minkowski's Object" isn't mentioned there.
    On the webpage of NRAO there is an image and information available about Minkowski's Object!

    Posted

  • Dolorous_Edd by Dolorous_Edd

    However it is photometric object in DR 7

    enter image description here

    http://skyserver.sdss.org/dr7/sp/tools/explore/obj.asp?id=587739809416478987

    Posted

  • zutopian by zutopian in response to Dolorous Edd's comment.

    Photometric redshift of the blue object according to DR7 is as follows.: z= 0.081853 (zErr 0.015714)
    Spectroscopic redshift of the elliptical* according to NED is as follows.: z=0.107
    So I think, that it is likely, that both are located at the same distance!

    '* SDSS J144625.28+214139.7

    Posted

  • Dolorous_Edd by Dolorous_Edd

    Just for reference

    a z = 0.07 grav lens CSWA 18

    enter image description here

    SDSS J113406.74+253335.1

    Posted

  • zutopian by zutopian in response to zutopian's comment.

    If the blue curved object and the elliptical are indeed located at the same distance, it is ruled out to be a gravitational lens!

    Posted

  • Dolorous_Edd by Dolorous_Edd in response to zutopian's comment.

    Not really, remember, we are dealing with photometric redshift and not spectroscopic

    Here is an example

    Conformed lens

    http://skyserver.sdss.org/dr12/en/tools/explore/Summary.aspx?id=1237653651300483269

    ZL 0.3810 ZS 2.7310

    ph_z of the arc ~0.128

    Posted

  • zutopian by zutopian in response to Dolorous Edd's comment.

    Not really, remember, we are dealing with photometric redshift and not spectroscopic

    Sorry, but I am not sure, what you mean!

    I had written following:

    Photometric redshift of the blue object according to DR7 is as follows.: z= 0.081853 (zErr 0.015714)
    Spectroscopic redshift of the elliptical* according to NED is as follows.: z=0.107
    So I think, that it is likely, that both are located at the same distance!

    '* SDSS J144625.28+214139.7

    ...and later following in another post.:

    If the blue curved object and the elliptical are indeed located at the same distance, it is ruled out to be a gravitational lens!

    Posted

  • Dolorous_Edd by Dolorous_Edd in response to zutopian's comment.

    SDSS J002240.91+143110.4 is a conformed lens ( 8 o'clock arc )

    Spectroscopic redshift of the ETG SDSS J002240.91+143110.4 is z= 0.381

    SDSS J002240.96+143113.9 / SDSS J002241.14+143112.6 / SDSS J002240.77+143113.9 is a single lensed galaxy

    Spectroscopic redshift of the lensed galaxy is z = 2.73

    photometric redshift of the lensed galaxy is z = 0.128; 0.084 or absent; depending on the component

    Point is: if you are dealing with lens, photometric redshift of the arc is not very helpful

    Posted

  • 1001G by 1001G

    DR 7 PHOTOMETRIC OBJECTS IMAGE. SDSS J144624.37+214145.6

    enter image description here

    Posted

  • JeanTate by JeanTate in response to 42jkb's comment.

    There are other 'non-yellow' blobs nearby SDSS J144625.28+214139.7; some are DRx photometric objects, others not.

    I'll do a zoomed-in contour overlay image later, using just FIRST.

    One thing I find particularly odd about this field is that the host of the large (in extent) FIRST/NVSS doublelobe is - apparently - neither of the two big, obvious ellipticals ...

    Posted

  • zutopian by zutopian in response to zutopian's comment.

    I speculate, that it might be an object like Minkowski's Object*, especially because it apparently lies right where the FIRST radio jet stops!

    There is following paper.:

    Minkowski's object - A starburst triggered by a radio jet
    Authors: van Breugel, W.; Filippenko, A. V.; Heckman, T.; Miley, G.
    Publication Date: 06/1985
    http://adsabs.harvard.edu/cgi-bin/bib_query?1985ApJ...293...83V

    On page 7 there is shown a Radio map image (Fig. 5). There is given following statement.:
    "Note Minkowski's Object at the end and slightly to the side of the NE jet."

    So the "blue curved object" (DR7: 587739809416478987) and "Minkowski's object" are both located at the end of a radio jet!

    Posted

  • zutopian by zutopian

    Here are SDSS images, which show Minkowski's Object.:

    enter image description here
    Minkowski's Object:
    http://skyserver.sdss.org/dr12/en/tools/explore/Summary.aspx?id=1237678890666492023

    enter image description here
    The early-type galaxy is NGC 0541.:
    http://skyserver.sdss.org/dr12/en/tools/explore/Summary.aspx?id=1237678890666492000

    enter image description here

    Posted

  • JeanTate by JeanTate

    Zoomed in somewhat, and just FIRST contours:

    enter image description here

    The image in this post was created from sources, and using methods, described in this RGZ Talk post. The object at the center of the image is SDSS J144625.28+214139.7

    Posted

  • antikodon by antikodon

    similar ARG0000e77 host SDSS J160634.96+535337.4 sp z .350, Starburst galaxy sp z .342

    Posted

  • JeanTate by JeanTate in response to antikodon's comment.

    enter image description here

    Here's the zsp 0.350 host, with it's strange bluish-green cloud (the spectrum of the center is like that of a 'dead and red' elliptical):

    enter image description here

    Does the nearby zsp 0.353 SDSS J160633.01+535358.7 - which seems to have some faint green EELRs (more likely to be just noise, right?) - with faint core radio emission, also have an E lobe, which might seem as (part of) the NW lobe of the #nat? Or is the radio morphology even more complex?

    enter image description here

    What do you think?

    The image in this post was created from sources, and using methods, described in this RGZ Talk post. The object at the center of the image is SDSS J160634.96+535337.4

    Posted