Unified Seyfert Schemes and the Cosmic X-Ray Background

Details Unified Seyfert Schemes and the Cosmic X-Ray Background Unified Seyfert Schemes and the Cosmic X-Ray Background

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.5301m&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #53.01; Bulletin of the American Astronomical Society, Vol. 25, p.890

Astronomy and Astrophysics

Astronomy

Scientific paper

We have investigated the hard X-ray properties of obscured AGNs as predicted by the popular unification schemes. We consider the reprocessing of X-rays by photoelectric absorption and Compton scattering in cold, Thomson thick material, and compute the transmitted spectra expected for AGNs. We discuss the recent OSSE findings and show that the combination of absorption at low energies, and downscattering together with an intrinsic cutoff in the primary photon distribution at high energies, generates a transmitted spectrum which exhibits a narrow peak in the hard X-ray band. We assess the merits of reprocessed AGNs as the root cause of the XRB. We study the parameter space available to a simple \lq`obscuration" model and argue that that a population of heavily self-absorbed AGNs with an exponential cutoff at high energies may plausibly explain the cosmic X-ray background.

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