The Unified Seyfert Scheme and the Origin of the Cosmic X-Ray Background

Details The Unified Seyfert Scheme and the Origin of the Cosmic X-Ray Background The Unified Seyfert Scheme and the Origin of the Cosmic X-Ray Background

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.270l..17m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 270, NO. 2/SEP15, P. L17, 1994

Astronomy and Astrophysics

Astronomy

184

Scientific paper

We discuss a simple model for the cosmic X-ray background (XRB), based on the unified Seyfert scheme. We show that a mixture of unabsorbed type 1 and absorbed type 2 Seyferts, integrated in redshift back to z = 3.5, can simultaneously reproduce the spectrum of the XRB from 1 to 150 keV and the source counts in both the soft and hard X-ray bands. The presence of numerous, heavily obscured sources with hard spectra at a flux level of 10^-12^ erg cm^-2^ s^-1^ is indicated as a test of the model,in view of forthcoming ASCA observations.

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