Radio Galaxy Zoo Talk

2MASX J09470799-1338276 - A triple with rather impressive LAS

  • Dolorous_Edd by Dolorous_Edd

    To quote myself from this thread Interesting things from NVSS

    Well ... is that an enormous triple??

    A typical FR II triple, but the angular size is rather impressive ~26 - 27' ( to put this into perspective: the size of the full moon on the sky is ~30' )

    Such large radio galaxies are rare quests here, so I think this is a rather intersting objects

    Sadly outside SDSS and VLA FIRST footprint, so here is DSS image with contours from NVSS (red ) and VLSSr (green )


    Judging from NVSS maps the host appears to be 2MASX J09470799-1338276

    The whole thing is also visible in GB6 survey image

    Black is contours from NVSS

    enter image description here

    Sadly no redshift, so the actual size of this source is a mistery 😦

    Here some close-ups of the host, courtesy of zooite JeanTate

    The images were created using methods, described in this RGZ Talk post

    "Luptonized" DSS image


    "Luptonized "WISE


    Zooite WizardHowl left a comment back then

    Agreed, I had a look in Skyview and it's really has to be a giant but almost nothing is known about it that I could tell. Simbad has nothing at all on it. It shows up clearly in DSS2 (red, blue and IR) and is bright in blue as well as red, so although I can't tell anything about its morphology I'm going to hazard a guess it's a QSO rather than an ETG. Really should be followed up!

    Absence of references in the NED and SIMBAD is a bit puzzling, you would expect such source to be noticed

    Alas, without spectrum and redshift this all pure guesswork, DSS is too low res to distinguish morphology
    IMO doesn't look like QSO, more like a galaxy
    And likely at low z since it visible even in DSS

    Image from DSS2 Red ( is it me or host has some sort of pale halo? )


    Perhaps somebody with more expertise in this field will comment on this?


  • HAndernach by HAndernach scientist, translator

    2MASX J09470799-1338276 is a KNOWN giant, whose redshift was measured as
    z=0.0800 +- 0.0002 by 2007AcA....57..227Machalski et al., but this journal
    (Acta Astronomica, published in Poland) is not covered by NED, so you don't
    see the redshift nor reference in NED. The reference was indeed covered
    by Simbad, but its staff didn't identify the object with any known galaxy,
    since the authors don't give any overlay image, nor do they quote any name
    nor exact position, too much work for the Simbad staff.
    It also has a photometric redshift of z_ph=.084 (from 2014ApJS..210....9Bilicki),
    but this catalog is too recent and will possible never enter Simbad nor NED.
    In fact we also obtained a consistent redshift of z = 0.0795 for it in
    April 2014 with a 2-m telescope in Mexico (yet unpublished). This makes
    it 2.3 Mpc in projected linear size.


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

    Thanks for the reply!

    BTW what is the morphology of the host? Is it ETG?


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

    I second Dolorous Edd's question (great detective work finding this by the way, and a nice write-up).

    I'm also curious about the colors; for z ~0.08, it seems rather blue (based on DSS2) for an ETG.


  • HAndernach by HAndernach scientist, translator

    I'm not expert on quantitative colors as function of morph. type,
    and in our spectroscopy run we did not take an image. But it is
    curious that 2MASX J09470799-1338276 is also detected
    in GALEX (in the UV!). You can see the photometric values of GALEX
    and 2MASS in the photometric frames of NED for this galaxy.

    The LEDA database give total B and I mags of 17.1+-0.5 and
    14.94+-0.10 mag, respectively. From VizieR (USNO B1.0 catalog)
    I find B2/R2/I mags of 13.7 13.8 14.0, but note that USNO is tuned
    to measure stars. From the SuperCosmos, possibly
    better than USNO, I find b,r,i=16.7,15.9,15.4 mag.

    Curiously it is also listed in the 2MASS point source catalog as
    2MASS J09470800-1338276, (which looks like an inconsistency),
    so may be it has a blue/ish nucleus?
    It is listed in AllWISE with magnitudes (W1, ... W4): 13.045+-0.02,
    12.965+-0.029, 11.461+-0.212, and >8.567 mags.
    Not sure with this we can infer anything on the morphology? I looked
    at DSS in both blue and red, and it is amorphous, but looks to have a
    bright core, brighter than an average elliptical.

    The SALT spectrum shown in 2007AcA....57..227Machalski et al. show a
    continuum that is possibly too flat for an ETG. But the [NII] lines
    being much more intense than Halpha shows it to be an AGN.


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

    NVSS contours overlaid on Luptonized DSS2 image:

    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 2MASX J09470799-1338276.


  • Dolorous_Edd by Dolorous_Edd

    Just for the hell of it

    Host as seen by CFHT R-band ( also G-band available )

    Elliptical E0?

    enter image description here