Evolution of Accretion Power from the ChaMP

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Optical imaging and spectroscopy by the Chandra Multiwavelength Project (ChaMP) is characterizing a sample of serendipitous X-ray sources over 14 deg^2 of sky, 70× times more area than the Chandra Msec deep surveys, and 10-20 times deeper than any pre-Chandra survey. Our final sample will greatly advance studies of the nature, evolution, and clustering of X-ray selected AGN and galaxies. Chandra's unique low background, (0.3-8keV) sensitivity, and ⪉ 1 arcsec PSF allow unambiguous identification of optical counterparts of even obscured AGN (proposed constituents of the cosmic X-ray background) to redshift 5. We propose here for continued MOSAIC imaging, critical to source identification and classification, to achieve a vastly improved estimate of the intrinsic luminosity function of AGN and its evolution beyond the optical quasar heyday of z~2.5. The wide-area is also proving invaluable for discovery of high-z clusters, and for probing the fascinating and intricate connections between structure formation, star formation, and accretion power in the Universe. Even without Survey status, our calibrated X-ray and optical imaging and photometry is already going public, and will facilitate research by other teams.

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