QSO or radio galaxy behind a star? No redshift (spec,phot)!
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by zutopian
QSO or Star?
http://skyserver.sdss.org/dr12/en/tools/explore/Summary.aspx?id=1237662199893327884Radio galaxy behind a star or host galaxy of a QSO?
http://skyserver.sdss.org/dr12/en/tools/explore/Summary.aspx?id=1237662199893327895Curiously, this object is neither listed as QSO in NED nor Simbad! There is no redshift (neither spec nor photometric) available in SDSS/NED! Could someone please estimate the photometric redshift of this object?
Or is it a star? There is a part of a galaxy visible behind the blue object (in the center of the 2nd image)! Is it a radio galaxy, which is overlaped by a star? Or is it a part of the host galaxy, which harbours a QSO?
The galaxy has also no redshift (spec, phot)! What might its morphology be? I guess spiral or disc galaxy because of its colours!Posted
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by Dolorous_Edd
What might its morphology be?
IMO ETG and judging by color z less than 0.4
Star is also dubious just by eyeballing if it is a STAR it should be hot O type
Posted
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by 42jkb scientist, admin
The host is most likely not a star as stars with radio emission are hard to detect.
Posted
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by c_cld
The bright blue object seems binary:
1237662199893327884
Is it a coincidence overlap of foreground star and galaxy or two galaxies? visual or spectroscopic binary?
I cam't say even when looking at each band by Aladin.Not much to tell by querying Vizier...
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by ivywong scientist, admin
The SDSS images have the following flags:
DEBLENDED_AT_EDGE STATIONARY BINNED1 SUBTRACTED INTERP COSMIC_RAY CHILDand so, we have to be very careful with how we interpret the flux/colors that result for this particular source as per:
https://www.sdss3.org/dr8/algorithms/flags_detail.phpPosted