High Redshift Evolution of X-ray-Selected AGN

Details High Redshift Evolution of X-ray-Selected AGN High Redshift Evolution of X-ray-Selected AGN

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.3206g&link_type=abstract

American Astronomical Society, HEAD meeting #8, #32.06; Bulletin of the American Astronomical Society, Vol. 36, p.970

Astronomy and Astrophysics

Astronomy

Scientific paper

Is the sharp dropoff in the optical QSO space density at z>3 caused by the latency of massive accretion, or simply by intrinsic absorption of optical/UV emisison? X-ray selection is crucial (1) for an unbiased census of accreting supermassive black holes, (2) for understanding their evolution in the context of star- and bulge formation, and (3) to explain the spectral shape of the Cosmic X-ray Background. The Chandra Multiwavelength Project (ChaMP) is a serendipitous survey of the X-ray sky which covers about 14 sq.deg. of sky in the X-ray flux range of -13 to -16 (log 2-10 keV flux, cgs) and includes about 8000 X-ray sources, with markedly decreased bias against absorption. ChaMP optical followup has now classified hundreds of these sources out to z>4. We discuss new results on the high-z X-ray luminosity function and contrast to the evolution of optical quasars.
We gratefully acknowledge the financial support of NASA grant: AR4-5017X (Chandra).

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