NOAO >   Observing Info >   Approved Programs >   2004B-0222

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Proposal Information for 2004B-0222


PI: Wayne Barkhouse, Harvard-Smithsonian, CfA, wbark@head-cfa.harvard.edu
Address: High Energy Astrophysics, MS-4, 60 Garden Street, Cambridge, MA 02138, USA

CoI: Paul Green, Harvard-Smithsonian, CfA
CoI: John Silverman, Harvard-Smithsonian, CfA
CoI: Robert Cameron, Harvard-Smithsonian, CfA
CoI: Belinda Wilkes, Harvard-Smithsonian, CfA
CoI: Minsun Kim, Harvard-Smithsonian, CfA
CoI: Buell Januzzi, NOAO
CoI: Paul Smith, NOAO

Title: The Cosmological Evolution of X-ray Selected AGN

Abstract: The Chandra Multiwavelength Project (ChaMP) will measure the intrinsic luminosity function and comoving space density of X-ray selected quasars out to z~eq 5. X-ray selection, unlike optical, is sensitive to both obscured and unobscured AGN. A statistical X-ray sample allows us to address questions such as: What contribution from obscured AGN has been missed by previous surveys? Does the absorbed fraction evolve? When the Universe was 15% its current age, were quasars rare or simply awaiting fueling? Including obscured quasars will allow the first real test of deviations from pure luminosity evolution. The ChaMP covers 70 times more area than the Chandra Msec deep surveys, and probes 10-20 times deeper than any pre-Chandra survey. While 389 AGN (18 with 3 < z < 5) have already been discovered by ChaMP in 23 Chandra fields, we need ~ 50 z > 3 AGN to robustly compare the high-z optical and X-ray quasar populations, measure their evolution from high-z, and address the above questions. We propose for time to complete the NOAO/4m imaging program for this semester (15 fields; used for source ID and classification), plus HYDRA spectroscopy of 8 deep ChaMP fields imaged previously at NOAO.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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