ARG0003k9d / FIRSTJ000340.2+040116 - giant?, known?
Flagged by antikodon
The host is 2MASX J00033150+0351114
NVSS ( also lobes are visible in the GB6 survey (right image) )
SIMBAD search result
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? )
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
Even more remarkable than you wrote, many months ago.
Here's the z_sp host, SDSS J000331.50+035111.0:
And its SDSS spectrum:
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:
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.
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'.