The Largest z>3 Sample of X-ray Quasars: COSMOS

Details The Largest z>3 Sample of X-ray Quasars: COSMOS The Largest z>3 Sample of X-ray Quasars: COSMOS

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733537c&link_type=abstract

American Astronomical Society, AAS Meeting #217, #335.37; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Multiwavelength identification campaigns from medium deep and deep X-ray surveys with XMM and Chandra have opened a new perspective in the study of the high-redshift (z>3) AGN population. For the first time, were able to provide sizable samples of quasars with luminosities above logLx=43.5. However, samples sizes have been quite limited, limiting the conclusions that can be drawn. We present the properties of the largest sample (61 sources) of X-ray selected z>3 AGNs, from the Chandra COSMOS survey. This sample defines the space density and evolution of the z>3 X-ray selected AGN population. The z>4 population is sampled usefully, and the z>5 population is beginning to emerge. The results are compared with predictions from XRB synthesis models and semianalythic models of galaxy formation. Some models are clearly excluded.

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