AAS 205th Meeting, 9-13 January 2005
Session 155 X-ray Sources
Oral, Thursday, January 13, 2005, 10:00-11:30am, Golden Ballroom

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[155.04] The Serendipitous Extragalactic X-Ray Source Identification (SEXSI) Program

M.E. Eckart, F.A. Harrison (Caltech), D.J. Helfand (Columbia), D. Stern (JPL/Caltech)

The Serendipitous Extragalactic X-ray Source Identification (SEXSI) program has extended the sample of identified hard X-ray (2-10 keV) sources at intermediate fluxes to further our understanding of source populations contributing to the X-ray background. SEXSI, which studies over 1000 hard X-ray sources selected from more than 2 square degrees of archival Chandra data, provides an essential complement to the Chandra Deep Fields. In the flux range 10-13 to 3 x 10-15 erg cm-2 s-1 where the log N - log S relation changes slope and from which the bulk of the hard X-ray background arises, we have the largest sample of identified sources to date. We have obtained optical imaging for over 95% of our sample, and spectroscopic redshifts, primarily from Keck Observatory, for ~450 hard X-ray sources from our sample. We discuss the results from our survey, including the spectroscopic properties of hard X-ray sources, the relationship between X-ray and optical properties of our sources, and our sample of spectroscopically-confirmed, narrow-lined, obscured type II quasars.

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© 2004. The American Astronomical Society.