Radio Galaxy Zoo Talk

The doughnut in NGC 6109 (paper)

  • zutopian by zutopian

    Extreme jet bending on kiloparsec scales : the 'doughnut' in NGC 6109
    Authors: Josie Rawes, Mark Birkinshaw, Diana M Worrall

    We present new radio observations of the z = 0.029 radio galaxy NGC 6109, a member of the 3CRR sample. We find the radio morphology of the counter-jet to be highly distorted, showing a unique 'doughnut' structure ~6 kpc in diameter. (...)

    https://arxiv.org/abs/1808.01967

    (Submitted on 6 Aug 2018)

    Posted

  • zutopian by zutopian

    RGZ ID of NGC 6109 :

    https://radiotalk.galaxyzoo.org/#/subjects/ARG0001fn3

    What is the RGZ ID of the lower part jet? The doughnut isn't visible on the above image, but on the counterpart image! (Compare with Figure 6 in the paper)

    Posted

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

    What is the RGZ ID of the lower part jet?

    There are several, e.g. ARG0001fp5. To find more, you can use the methods described in this thread: I have a position, how do I find which ARG fields contain it (if any)? SOLUTION

    The doughnut isn't visible on the above image,

    Actually, I think it is ... it's just that the resolution of FIRST is too coarse to show it as a doughnut, nor as detached object. It would be cool if a radio astronomer could comment too.

    Hope this helps, and happy hunting! 😃

    Posted

  • zutopian by zutopian

    On following RGZ images NGC 6109 is in the center.:

    https://radiotalk.galaxyzoo.org/#/subjects/ARG0001fp1

    https://radiotalk.galaxyzoo.org/#/subjects/ARG0001fp5

    The images seem to be identical/ Duplicate at first sight, but they aren't!

    Posted

  • ivywong by ivywong scientist, admin

    Yes, the centre of each your subject above is of a different part of the emission. It was difficult for us to do an automated selection of source components from the original source catalogue and so sometimes the same radio galaxy does appear more than once in the project.

    Posted

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

    I think following.: Either the doughnut is outside of the RGZ images found showing NGC 6109 or there isn't any RGZ image, where the doughnut is visible!

    EDIT:

    I compared the RGZ images with an image in the paper, namely Fig. 6.:
    I guess, that the doughnut doesn't show up on any RGZ image. On the image in the paper the doughnut is next to the galaxy!

    Posted

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

    I think it's just a difference in scale: if you estimate the distance (in arcmin or arcsec) of the doughnut from the galaxy center (where the AGN is), from the paper, you'll find it's ~the same as that in ARG0001fp5 (which seems to me to be centered on the doughnut; check the two positions, also given in the paper).

    Posted