Green mystery object
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Green bright object in SDSS, object classified as star, no supernova reference
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?id=1237668270842446079
SDSS DR5, date 05-12-2005
SDSS DR9, date 05-09-2005
Not visible in DECaLS DR1
And a NED reference as QSO candidate reject with z=3.315
http://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=59261337&objname=1&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1
So this raises some questions 😃 ;
- am i right that this is probably a supernova?
- wouldn't a supernova be inside the galaxy? This one looks far outside the galaxy
- are there many supernova's in SDSS without a SN reference, eg not classified?
- how is it possible to have a redshift of 3.315? Really far off?
Posted
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by
Budgieye
moderator
The only way to be sure that it is a supernova is to take a spectrum. or look for lingering X-ray. Probably not possible now, it will have faded.
We don't see the edges of galaxies, we only see the brighter bits, so the supernova could be in a galaxy.
Zooites have found some possible supernova, by looking at before, during and after images. see
Unreported supernova #SNe http://talk.galaxyzoo.org/#/boards/BGZ0000007/discussions/DGZ00016qc
z values and labels can be wrong. They are calculated by computers, and need a human to check up on them. The spectra of a supernova and of a green quasar are very similar, and software will have a hard time deciding.
SN 2002bx
green quasar z=4 http://skyserver.sdss.org/dr10/en/tools/explore/summary.aspx?id=0x112d08c88082014a&spec=0x09c81f8809006800&apid=
SDSS has had a survey just dedicated to looking for supernova. More info here
4.1 Supernova in Talk, Forum, SDSS The Legacy Survey: Stripe 82, and Galaxy Zoo: The Hunt for Supernova. BBC Stargazing Live Snapshot Supernova http://talk.galaxyzoo.org/#/boards/BGZ0000001/discussions/DGZ0000wrb?page=4&comment_id=53d8b997db90c7673f00101d
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