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P.J. Green, J.D. Silverman, W.A. Barkhouse, D.-W. Kim, M Kim, B.J. Wilkes, A.E. Mossman, H. Tananbaum (SAO), ChaMP Collaboration
Luminous optically-selected quasars we most common 2-3Gyr after the Big Bang, but we know that much of accretion onto supermassive black holes is obscured, perhaps even more so in the early Universe. Both the intrinsic physical properties of high redshift (z>3) quasars and their population statistics are of interest, but few X-ray-selected examples are known to date. The Chandra Multiwavelength Project now provides a significant number. We present new results on spectral energy distributions and evolution of these objects, including a revised X-ray luminosity function that maximizes the sample size using a large compilation of surveys, with ChaMP the primary contributor at high-z.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.