Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360806b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #608.06
Astronomy and Astrophysics
Astronomy
Scientific paper
Sub-millimeter galaxies (SMGs) are believed to be very massive galaxies, perhaps the result of mergers, with high star formation rates of up to 1000 solar masses per year. Whether they harbor highly obscured AGN is still an open question. In this poster, we report the X-ray properties of a sample of 26 ASTE/AzTEC sources detected at 1.1 mm in the Extended Chandra Deep Field South (ECDFS), one of the MUSYC fields and, with an area of 0.3 deg2 and an X-ray depth of 230 ks, one of the largest deep X-ray surveys. We matched 9 of the 26 AzTEC sources with S/N > 3 and S1.1mm > 9 mJy to radio sources from a catalog of 514 sources with S1.4 GHz > 8uJy, in order to obtain more accurate positions than afforded by the 30" resolution of the sub-millimeter beam. Two of the 9 are detected in X-rays, suggesting the AGN fraction of SMGs is 20%. The 7 remaining sub-millimeter sources are not detected individually in X-rays but yield a clear detection in the stacked X-ray image, with an average X-ray flux of 2.5E-16 ergs/cm2/s. The X-ray spectrum of the stacked sources is soft, and since photometric redshifts from MUSYC suggest the majority of sources have z<1, we conclude that the X-rays from these sub-millimeter galaxies are most likely due to star formation. The lack of a detection in the hard X-ray band rules out the possibility that, on average, SMGs host heavily obscured AGN. We compare these results to various stacks of the 514 radio sources in the ECDFS.
ASTE/AzTEC Team
Berwick Elissa
Cardamone Carie
Cortes Jorge
Gawiser Eric
No associations
LandOfFree
X-ray Properties of Sub-millimeter Galaxies in the Extended Chandra Deep Field-south does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with X-ray Properties of Sub-millimeter Galaxies in the Extended Chandra Deep Field-south, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray Properties of Sub-millimeter Galaxies in the Extended Chandra Deep Field-south will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1765624