Radio Galaxy Zoo Talk

ARG0000fkg, triple, distant host.

  • ChrisMolloy by ChrisMolloy

    Here's ARG0000fkg, which appears to be a #triple. The contour overlay image below has been centred south west of the ARG listed co-ordinates left, due to their being no apparent photometric object located at this position.

    enter image description here

    The contour overlay image in this post was created from sources, and using methods, described in this RGZ Talk
    thread.     First in red, Wise band 1 lime green.

    There are radio references in NED for SDSS J122434.32+530513.4. This object has a z_ph=0.490 ± 0.0989, and is centred to the NW of the SW First lobe. This galaxy has an ALLWISE reference, ALLWISE J122434.33+530513.7, and there is a corresponding, albeit faint, Wise Band 1 contour at this position.

    SDSS J122434.32+530513.4

    enter image description here

    To the centre east of the First lobes there are again further radio references in NED for SDSS J122439.94+530523.5, which has a z_ph=0.354 ± 0.1053. This object also has an ALLWISE reference, ALLWISE J122439.93+530523.3, and once again there is a faint ir source in the ARG image left, and corresponding Wise Band 1 contour, at this position.

    SDSS J122439.94+530523.5

    enter image description here

    Finally, there is an ALLWISE reference, ALLWISE J122436.54+530522.1, and a correspondingly strong ir signal in the ARG image left, and Wise Band 1 contour image above, positioned in the centre of the First lobes. There are radio references in SIMBAD for an object at this position, but there doesn't appear to be any photometric objects listed in SDSS DR14 at this location.

    So, a distant, #no-optical, host, for this First #triple emission.

    As always, comments, suggestions, welcome.

    Posted

  • JeanTate by JeanTate

    This one is a challenge too!

    On the one hand, there are two hotspots with a faint core between them, and the core ~coincides with an IR source; classic triple.

    On the other hand, the SW lobe's axis (ridgeline) is at a significant angle (~50 degrees?) to the hotspot-core-hotspot line, and there's nothing close that might be the core of a one-sided lobe, if this were an #overlap.

    Here's an SDSS "Finding Chart" with the three objects mentioned (two SDSS, one ALLWISE), centered on the first (SDSS J122434.32+530513.4), scale 0.4"/pix, 512x512 pix:

    enter image description here

    Posted

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

    Thanks. Next time, in tricky cases like the above, I'll label the possible hosts in the contour overlay image.

    Posted