Physics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf..123w&link_type=abstract
In MPI für Extraterrestrische Physik, X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 123-129 (SEE
Physics
1
Accretion Disks, Active Galactic Nuclei, Background Radiation, Cosmic X Rays, Rosat Mission, Stellar Models, Emission Spectra, Gamma Ray Spectra, Quasars, X Ray Sources, X Ray Spectra
Scientific paper
Two new elements, the Hybrid Accretion Disk (HAD) model and the Rosat survey of resolved X-ray sources and diffuse background, are combined in an attempt to resolve the long standing problem of the cosmic X-Ray Background (XRB), explaining the diffuse XRB as the integrated radiation of unresolved early quasars and Active Galactic Nuclei (AGN). It is suggested that a large fraction of the soft and hard XRB is produced by early AGN with intrinsic spectra different from low redshift AGN. When redshifted from z = 3 to 5 the HAD spectrum yields the two major features of the XRB: the flat bremsstrahlung spectrum at a few tens keV, and the soft X-ray power law discovered by Rosat. It is demonstrated that emission from HAD's in AGN can explain the XRB spectrum over the entire range from soft X-rays to gamma rays.
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