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P.J. Green, J.D. Silverman, T.L. Aldcroft, W.A. Barkhouse, R.A. Cameron (CfA), C.J. Foltz (NSF), B.T. Jannuzi, D.-W. Kim, M. Kim, A.E. Mossman, M.G. Smith, R.C. Smith (NOAO), P.S Smith, H. Tananbaum, B.J. Wilkes (Steward), ChaMP Collaboration
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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The author(s) of this abstract have provided an email address for comments about the abstract: pgreen@cfa.harvard.edu
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Bulletin of the American Astronomical Society, 36 #3
© 2004. The American Astronomical Soceity.