Radio Galaxy Zoo Talk

ARG0003k9d / FIRSTJ000340.2+040116 - giant?, known?

  • Dolorous_Edd by Dolorous_Edd

    Flagged by antikodon

    The host is 2MASX J00033150+0351114

    NVSS ( also lobes are visible in the GB6 survey (right image) )

    enter image description here
    enter image description here

    SIMBAD search result

    enter image description here

    Results of my lame attempt to search on Vizier , 00 03 31.50 +03 51 11.3, J2000, 5 arcmin rad ( also NAIC - is it Arecibo? )

    enter image description here

    Z = 0.095 is not impressive, but the size ...

    Almost 20 - 21 arcmin wide, mind you

    I would say around ~2Mpc

    Edit: Ok, did some preliminary search on SIMBAD - no hits

    Got hits on Vizier, but IMHO some general radio surveys

    NED within 20 arcmin

    Posted

  • Dolorous_Edd by Dolorous_Edd

    @DocR @HAndernach

    enter image description here

    Posted

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

    Even more remarkable than you wrote, many months ago.

    Here's the z_sp host, SDSS J000331.50+035111.0:

    enter image description here

    And its SDSS spectrum:

    enter image description here

    Visual color-wise, in the SDSS image, it looks like an ETG; at z 0.095 the sky real estate it takes up makes it pretty big. Even for a football, however, it's pretty squashed; too much for an elliptical (giant ellipticals with ellipticity > 4 are rare; > 5? none, IIRC)? (I need to check).

    In the meantime, here's my contour overlap image:

    enter image description here

    Boilerplate: SDSS image per http://skyservice.pha.jhu.edu/DR10/ImgCutout/getjpeg.aspx, FIRST (red) and NVSS (cyan) contours derived from FITS files produced using SkyView with Python code described in this RGZ Talk thread. Image center (J2000.0) is the galaxy SDSS J000331.50+035111.0; "z_sp" its SDSS spectroscopic redshift.

    Posted

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

    Um, I was wrong. 😦

    Inverse concentration ratios and fracDeV tests are all consistent with SDSS J000331.50+035111.0 being an elliptical, although neither is particularly definitive (the latter because many disk galaxies fail it, the former particularly fails when there's an optical AGN). In terms of ellipticity, it's an E4 (E3 in the u-band). Extreme, for a giant elliptical, but not enough to say 'not a boring elliptical'.

    Posted