Effect of X-ray spectra of Seyfert galaxies on the cosmic X-ray background

Details Effect of X-ray spectra of Seyfert galaxies on the cosmic X-ray background Effect of X-ray spectra of Seyfert galaxies on the cosmic X-ray background

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..299m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 2, Sept. 1990, p. 299-304.

Astronomy and Astrophysics

Astrophysics

43

Background Radiation, Cosmic X Rays, Seyfert Galaxies, X Ray Spectra, Absorption Spectra, Active Galactic Nuclei, Luminosity

Scientific paper

Ginga observations of five Seyfert 1 galaxies have revealed that their X-ray spectra are not described by a single power law, but have an absorption-like feature at the energy of several to 10 keV and flatten at higher energies. This spectrum may be explained by the absorption of very thick cold matter with a column density of the order of 10 to the 24th to 10 to the 25th/sq cm, covering about half of the central source. It is found that the superposition of such spectra can reproduce the 3-100 keV spectrum of the cosmic X-ray background (XRB) provided that the spectra of Seyfert galaxies have an exponential cut off around 100 KeV.

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