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P.J. Green, J.D. Silverman, D.-W. Kim, R.A. Cameron, D. Morris, A. Dosaj, B.J. Wilkes, H. Tananbaum (Harvard-Smithsonian CfA), P. Smith (UAz), A. LaCluyze (MSU), ChaMP Collaboration
X-ray emission in AGN originates close (10-100RG) to the supermassive black hole and is a {\em primary signature of accretion} and uniquely {\em samples all known varieties of AGN}. A substantial wide-area sample of X-ray-selected active galactic nuclei (AGN) across the L-z plane is needed to determine how the evolution of black holes contrasts to evolution of galaxies and the star formation rate (SFR), each of which are likely affected by galaxy mergers in hierarchical clustering scenarios. The Chandra Multiwavelength Project (ChaMP) has begun to obtain redshifts and classifications for ~1800 X-ray selected sources with the goal of characterizing the evolution of the AGN X-ray luminosity function (XLF) with constraints similar to the optical. A primary advantage is the completeness afforded by Chandra's broadband (0.5-8keV) sensitivity, which admits absorbed sources not well-represented in previous soft X-ray or optical surveys.
We report on a spectroscopic subsample of ChaMP AGN and investigate the efficacy of photometric classification for these and fainter objects using the multicolor data afforded by the ChaMP, which includes our own deep optical (Sloan g\prime, r\prime and i\prime) imaging, X-ray fluxes and hardness ratios.
We are grateful for partial funding of the ChaMP project provided by NASA through a CXO archival research grant AR1-2003X.
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The author(s) of this abstract have provided an email address for comments about the abstract: pgreen@cfa.harvard.edu