AAS 201st Meeting, January, 2003
Session 138. X-Ray Observations of Quasars and AGNs
Oral, Thursday, January 9, 2003, 2:00-3:30pm, 616-617

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[138.06] Constraining the Nature of the X-ray Background through X-ray spectroscopy in the Chandra Deep Fields

F.E. Bauer (Pennsylvania State University), PSU Chandra Deep Fields Team

The Chandra Deep Field Surveys (1--2 Ms) provide the deepest view of the Universe in the 0.5--8.0 keV band and resolve more than 80 I will present detailed X-ray spectral analyses of the brightest ~200 sources in these fields. These faint sources are likely to represent the bulk of the 0.5-8.0 keV accretion activity in the Universe. Their spectra often appear to have complex signitures (e.g., reflection, Fe K\alpha emission lines, partial covering) characteristic of local moderate-luminosity Seyfert galaxies, whereas previous X-ray surveys primarily found more luminous, unobscured broad-line AGN. I will discuss these results in the context of the cosmological evolution of the AGN X-ray luminosity function and population synthesis models.

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