ARG000133z / FIRSTJ125209.2+411933 - diffuse anomaly
Flagged by antikodon
Well .. it is somehow stands out from standart NVSS noise pattern
by DocR scientist
Quite a catch! I'm trying to track this down, but it is a patch of diffuse emission outside of the nearby galaxy M94.
Left is Digital sky survey, right is NVSS (circled feature same as above). Middle frame is a processed version of NVSS to pull out diffuse features. It stands out as reasonably significant. Not visible in WENSS, unfortunately. Worth more effot.
This resembles a faint hourglass shape, of which FIRST picks up only the most compact part.
From the alignment of the NVSS and FIRST images, there is an extremely faint IR source at or very close to where the waist of the hourglass appears to be. There is also an extremely faint optical counterpart that may coincide with this in SDSS, SDSS J125211.20+411949.0 which has photoz measurements that are not in very good agreement (0.514 +/- 0.1496 and 0.320 +/- 0.1150).
The IR object is perhaps clearest in WISE band 2 (4.6 microns) but is still very faint and does not show up in bands 3 and 4; it's co-ordinates from WISE are RA: 193.047709 DEC: 41.329746 which agrees with the SDSS object to within a WISE pixel.
With such low signal-to-noise observations, it is possible/likely that this object is not at all related and the true source may simply be too faint to appear on these surveys.