Other
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370l..57r&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 370, April 1, 1991, p. L57-L60.
Other
26
Active Galactic Nuclei, Background Radiation, Compton Effect, Cosmic X Rays, Astronomical Models, Diffuse Radiation, Red Shift, X Ray Spectra
Scientific paper
This paper discusses further the model of Fabian et al. (1990) for the cosmic X-ray background (XRB) spectrum, in which the emission is due to AGNs at large redshifts. Each AGN emits a power-law spectrum modified by Compton reflection from cold gas. It is found that the model provides an excellent fit to the XRB from 3 to 500 keV if the sources radiate from a maximum redshift of at least 3.75, if their comoving emissivity varies like (1 + z) exp beta, with beta between 1.8 and 3.3, and if the intrinsic power-law energy index is between 0.9 and 1.2. About 90 percent of the power-law radiation in each AGN must be processed by Compton reflection. The model predicts that the intensity of the XRB below 3 keV is significantly above that extrapolated from observations above 3 keV, without requiring contributions from other types of source.
Field George B.
Rogers Robert D.
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