Radio Galaxy Zoo Talk

ARG0002w82 - big double lobe with no apparent host (IR or optical)

  • JeanTate by JeanTate

    Not an IFRS - because it's too big - and for the host to be invisible in both WISE and SDSS it must have a redshift >~0.7-0.8; if so, that would make this a giant, right?

    Posted

  • DocR by DocR scientist

    @JeanTate I'm not sure which nearby component you think is associated. Add a picture?

    Posted

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

    enter image description here

    There are two 'contoured' radio sources in the ARG field; the W one is slightly elongated and fairly bright, the E one faint and diffuse. If these are two lobes, then the host should be ~in the middle; there are no WISE or SDSS sources anywhere between the two radio sources. Assuming this is a double-lobe structure, at z=0.75, how big would it be (physically, in kpc)?

    Maybe I'm just completely misjudging distance (and should make my own estimate first, ...) 😦

    Posted

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

    Answering my own question:

    Assuming this is a double-lobe structure, at z=0.75, how big would it be (physically, in kpc)?

    ~300 kpc (per Ned Wright, 71/27/73 cosmology)

    Maybe I'm just completely misjudging distance (and should make my own estimate first, ...) :

    Yes, you (I) should ...

    Posted

  • DocR by DocR scientist

    This could be a double, west just brighter and more compact, east (left) looks like a classical hot spot. But there is a faint SDSS source SDSS J114730.86+120139.5 at the location of the peak in the eastern region, so who knows?
    enter image description here (I smoothed SDSSr a little to be able to see this.

    Posted