Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296.1011m&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 1011-1016 (SEE N90-2
Astronomy and Astrophysics
Astronomy
Background Radiation, Seyfert Galaxies, X Ray Astronomy, X Ray Spectra, Active Galactic Nuclei, Cosmology, Galactic Cosmic Rays, Galactic Evolution, Quasars
Scientific paper
Ginga observations of five Seyfert 1 galaxies revealed that their X-ray spectra have an absorption like feature at the energy of several to 10 keV. This feature is probably explained by the absorption of very thick cold matter, covering about half of the central source. It is found that the superposition of such spectra can reproduce the 3 to 100 keV spectrum of the cosmic X-Ray Background (XRB) provided that the spectra of Seyfert galaxies have an exponential cut off around 100 keV. If all Seyfert galaxies and quasars have such spectra and undergo the same cosmological evolution, the observed log N-log S relation of Active Galactic Nuclei (AGNs) and the intensity and fluctuation of the XRB, can be explained.
Matsuoka Masaru
Morisawa Katsuro
Piro Luigi
Takahara Fumio
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