ARG0002dun associated with edge-on?
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by zutopian
SkyView image:
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by JeanTate in response to zutopian's comment.
I just got this to classify. As WizardHowl says, there's a very bright nat nearby. But how to tell if the radio emission in this RGZ image (ARG0002dun) is an artifact of that nat?
Posted
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by JeanTate
Could there be a paper in sorting this one out? It's really strange! 😮
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Among the odd things - to me anyway - is the NVSS (but not FIRST) source at the middle bottom; is it associated with the disturbed (?) disk galaxy, or not?
Boilerplate: SDSS image per
http://skyservice.pha.jhu.edu/DR10/ImgCutout/getjpeg.aspx
, FIRST contours derived from FITS files produced using SkyView with Python code described in this RGZ Talk thread. Image center per the ARG image (left; J2000).Posted
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by WizardHowl in response to JeanTate's comment.
The clues that it is an artefact are:
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There is nothing there in NVSS, even though it is large and bright enough that there should be.
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Bright sources tend to have artefacts in a hexagonal arrangement around them (several other artefacts in the overlaid image above are visible as a result of this).
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The shape of the central feature is, in this case, similar to the bright source
As for the NVSS source you mention, I believe this may also be an artefact and not something associated with the disk galaxy. The hexagonal noise from FIRST also appears in NVSS but on a different scale - you have to zoom out a lot to see it and only really bright sources show it. It is quite faint compared to the nat but lies along a line running from 11 o'clock to 5 o'clock. The only way to be 100% sure would be to observe it with a radio telescope with a different noise pattern (I'm not sure but I suspect this might be in the field of view of both SKA and LOFAR, it's about the right DEC, if there is any crossover).
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