Physics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf..332t&link_type=abstract
In MPI für Extraterrestrische Physik, X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 332-337 (SEE
Physics
Active Galactic Nuclei, Background Radiation, Cosmic X Rays, X Ray Sources, Energy Spectra, Luminous Intensity, Mathematical Models, Quasars, Red Shift, X Ray Spectra
Scientific paper
The spectrum of the Cosmic X-ray Background (CXB) is characterized by the break around 20 keV. It is shown that the CXB spectrum is well reproduced by the superposition of Active Galactic Nuclei (AGN) spectra and no peculiar sources are needed to account for the CXB. Non-power-law components such as reflection component and a partial covering component in the AGN spectra are essential to reproduce the x-ray background spectrum. It is shown that the ultraviolet radiation from AGN can ionize intergalactic medium to be consistent with the Gunn-Peterson effect in the spectra of high redshift Quasi Stellar Objects (QSO's). It is shown that CXB is essentially explained by the superposition of x-ray radiation from AGN. Fairly low luminosity AGN have a dominant contribution to CXB. Reflection components and uniform absorbers are important for the spectra of AGN contributing to CXB. Partial absorber, which is found fairly in general in AGN spectra, can improve the predicted low energy spectra of CXB and this may suggest the contribution of Seyfert 2 galaxies.
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