Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360808t&link_type=abstract
American Astronomical Society, AAS Meeting #213, #608.08
Astronomy and Astrophysics
Astronomy
Scientific paper
The Cosmic Evolution Survey (COSMOS) provides a unique opportunity for the study of AGN with a combination of deep radio (VLA), infrared (Spitzer MIPS & IRAC), optical (Hubble/ACS & 21-band (Subaru/Suprime-Cam), UV (GALEX), and X-ray (XMM & Chandra) observations over 2 deg2. I will present results from a 3-year spectroscopic survey of X-ray and IR selected AGN in COSMOS using the Magellan/IMACS and MMT/Hectospec instruments. This spectroscopic sample reaches the customary quasar/Seyfert luminosity boundary at z 2, and also reveals Type 1 AGN with black hole masses of only 107 Msun to z 2. The IR selection additionally allows us to observe a large number of heavily obscured AGN, which recent pencil-beam surveys have revealed to be a significant fraction of the total AGN population. The obscured fraction of AGN in COSMOS shows the well-known luminosity dependence, but also shows the most significant evidence to date for redshift evolution. These dependencies suggest a strong case for dusty star formation driving AGN obscuration, with luminous AGN luminosity providing negative feedback. COSMOS also allows for new constraints on fueling mechanisms of obscured and unobscured AGN. A large sample of Type 1 AGN allows us to suggest limits on accretion rate for the presence of a stable BLR. And the largest sample of X-ray bright / optical normal galaxies (XBONGs) to date, complete with bolometric SEDs, suggests that these targets are actually radiatively inefficient accretors with truncated accretion disks. I will try to place these ideas in the framework of the AGN unified model and discuss how they might be especially tested with future Herschel and ALMA observations.
Brusa Marcella
Elvis Martin
Gabor Jared
Huchra John P.
Impey Chris David
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