NOAO >   Observing Info >   Approved Programs >   2004A-0394

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Proposal Information for 2004A-0394


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

CoI: Paul Green, Smithsonian Astrophysical Observatory
CoI: John Silverman, Smithsonian Astrophysical Observatory
CoI: Robert A. Cameron, Smithsonian Astrophysical Observatory
CoI: Buell Januzzi, NOAO
CoI: Belinda Wilkes, Smithsonian Astrophysical Observatory
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~eq5. The space density of optically selected quasars beyond z~eq3 will be robustly measured using our less-biased X-ray selected sample from Chandra. 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?, and does the absorbed fraction evolve? 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 300 AGN (18 with 3< z <5) have already been discovered by ChaMP in 25 Chandra fields, we need ~50 z>3 AGN to robustly compare the high-z optical and X-ray quasar populations, and their evolution from high-z. We propose for time to complete the NOAO/4m imaging program for this semester (24 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



NOAO >   Observing Info >   Approved Programs >   2004A-0394

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