Optical Identification of Chandra-COSMOS X-ray Sources

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The C-COSMOS survey is a recently completed 1.8 Ms Chandra program to image the center of the COSMOS field to a depth of 2e-16 cgs (0.5-7 keV). Adding the Chandra coverage to the COSMOS survey allows us to address several of the issues concerning the co-evolution of SMBH and their host galaxies and to fully characterize the SED of faint AGNs and starburst galaxies not detected in the XMM-COSMOS survey. We present the first optical identifications of the brighter C-COSMOS X-ray sources. We concentrate on the obscured AGN population, i.e. sources with high X-ray to optical ratio and/ or extremely red colors (EROs). The multiwavelength properties of these sources can be determined by fully exploiting the unique COSMOS multiwavelength dataset (including HST, Spitzer, multiband optical and near-IR photometry, and deep IMACS and VLT optical spectroscopy).

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