The Chandra COSMOS Survey: Early Results

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The Cosmic Evolution Of Agn

Scientific paper

The Chandra COSMOS Survey used ACIS-I to cover 0.5 sq.deg. to 160 ksec depth and an additional 0.4 sq.deg to 80 ksec, observed primarily in 2007. The C-COSMOS combination of depth and area produces large numbers of sources, 1761 point and some 200 extended sources. These numbers allow for good statistics on previously sparse samples (e.g. high z quasars), and for the discovery of rare classes of objects (e.g. double AGNs). The depth of C-COSMOS is well matched to the depth of the 40+ complementary imaging bands from radio to UV for the COSMOS field, which enabled >95% identifications rates, SEDs and accurate photo-zs to be found rapidly. All the sources and identifications are now submitted or in press.We present the latest early science results including: (1) z>3 quasars logN-logS, (2) a population of joint starburst/obscured AGN galaxies, (3) AGN vs. Starburst clustering, (4) Weak Lensing masses for AGN dark matter haloes, (5) off-nuclear (ULX?) objects, (6) Double AGNs, including CID-42 which shows high velocity redshifted Fe-K absorption, which we interpret as a ``backlit wind.''

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