Radio Galaxy Zoo Talk

ring of radio emission

  • WizardHowl by WizardHowl

    This does not look like radio emission from an AGN but rather a ring of star formation between two colliding galaxies. Most interested to see what SDSS has on them!


  • JeanTate by JeanTate

    Wish granted:

    enter image description here

    The big elliptical in the center - IC 4417 is its name - has a thoroughly 'dead and red' spectrum (z=0.025); the two yellow blobs to the right are SDSS J142452.54+170228.0 (zsp=0.134, 'STARFORMING') and SDSS J142451.92+170231.0 (zsp=0.052, also dead and red).

    So, chance alignment of three (!) different galaxies, at very different distances.

    Perhaps the radio emission is a faint #relic, of a time when IC 4417's AGN was A (we're seeing the relic as a nearly end-on fading lobe)?

    But I think the most interesting part of this image is the apparent edge-on galaxy, SDSS J142455.07+170236.1:

    enter image description here

    The SDSS pipeline could not give it a photoz, which is strange*. It's close to - but unambiguously offset from - the upper radio contour object (second brightest). Coincidence?

    *or not: SDSS has difficulty with photometry near bright galaxies


  • DocR by DocR scientist

    FIRST sources looks like the beginning of a #headtail #nat that then goes diffuse and bends around to the southwest. See below.
    enter image description here