ARG0001w1a - extended diffuse emission around spiral galaxy
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by Dolorous_Edd
To the S from the ARG field is IC 4234
A large patch of diffuse emission is visible in NVSS around ( also seems to be visble in GB6 survey )
SDSS J132259.87+270659.1 - 1237667323799994428 aka IC 4234
There is clearly large (and rather complex ) patch of diffuse emission around spiral galaxy, what could it be?
FIRST (blue) / NVSS (red)
SE ( from the galaxy ) compact source in FIRST doesn't have optical / IR ID
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by JeanTate
Cool! 😃 I wonder what the TGSS contour overlay looks like? Will find out ...
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by Dolorous_Edd
Spoiler
there is nothing, only triple which is in ARG field is visible
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by ivywong scientist, admin
Hi @Dolorous_Edd, how much above the noise is your lowest NVSS contour?
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by ChrisMolloy
Here's a First/NVSS overlay of the above image.
The contour overlay image in this post was created from sources, and using methods, described in this RGZ Talk
thread. First in red, NVSS cyan.NVSS and First parameters are as follows:
Nnsignoise = 2 (# NVSS noise floor, in sigmas);
Nsf = np.sqrt(2.0) (# NVSS contour scale factor);
Nsmooth = 20 (# sigma for gaussian smoothing) (NVSS contours)Fnsignoise = 1.5 (# FIRST noise floor, in sigmas);
Fsf = np.sqrt(3.0) (# FIRST contour scale factor);
Fsmooth = 4.0 (# sigma for gaussian smoothing) (FIRST contours)Posted
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by JeanTate in response to ChrisMolloy's comment.
That's a really cool image! 😃
Very unusual morphology for NVSS, wouldn't you say? I wonder how a professional radio astronomer would classify it?
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by DocR scientist
pretty cool! i'll check it out tomorrow
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by DocR scientist
This looks real to me. I subtracted out the two compact sources. the extended emission looks to be about 400kpc across. still working...
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by DocR scientist
The compact source at the bottom has no SDSS or WISE counterpart, so likely an unrelated background source, but curious. The AGN itself, IC4234, is located in a filament outside the Coma cluster, with a differential velocity of about 3000 km/s, so it's not bound to the cluster. I've never seen a source like this before. I'm talking with Tom Jones about how it could be explaned, so the story will continue...
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