Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.2302g&link_type=abstract
American Astronomical Society Meeting 204, #23.02; Bulletin of the American Astronomical Society, Vol. 36, p.689
Astronomy and Astrophysics
Astronomy
Scientific paper
In the optical a large population of AGN has been missed that 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. The sample is complemented by X-ray spectral fitting that also measures the evolution of intrinsic absorption with L and z. Finally, we describe our double-pronged optical/X-ray galaxy cluster detection methods and early results.
We gratefully acknowledge the financial support of NASA grant: AR4-5017X (Chandra).
Aldcroft Thomas L.
Barkhouse Wayne A.
Cameron Robert A.
ChaMP Collaboration
Green Paul J.
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