Radio Galaxy Zoo Talk

ARG00033ho: weird, just weird

  • JeanTate by JeanTate

    There's no doubt that zph 0.104±0.008 SDSS J221732.38+094920.3 is the (or a) host.

    enter image description here

    But the NVSS and FIRST cutouts are ... strange:

    enter image description here enter image description here

    OK, so FIRST is behind the times; the FIRST data RGZ used is more recent than that from third.unllnl.org, which explains why most of it is blank.

    The N lobe, in the ARG FIRST overlay image, looks quite like a degraded copy of the central+S source; is it, in fact, an #artifact?

    In NVSS, it seems that the FIRST radio emission is embedded in a broader source, with something like a distorted version of the main, #doublelobe-like emission to the SW ... a different artifact? or a separate, relatively faint, diffuse, source which FIRST is blind to?

    Posted

  • ivywong by ivywong scientist, admin

    FIRST typically resolves out diffused emission that is picked up by NVSS. That's the usual trade-off in interferometry, if you require small angular resolutions then you're also less sensitive to large angular scales. I think that this is a subject with multiple radio galaxies.

    The extra detection from NVSS may come from : SDSS J221726.91+094840.5 or SDSS J221726.87+094832.8

    Posted

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

    Thanks.

    A contour overlay image - NVSS and FIRST contours on an SDSS canvass - may help ...

    Posted