Observations and theory of X-rays and gamma-rays from radio-quiet Seyferts

Details Observations and theory of X-rays and gamma-rays from radio-quiet Seyferts Observations and theory of X-rays and gamma-rays from radio-quiet Seyferts

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15...27z&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 5, p. (5)27-(5)35

Astronomy and Astrophysics

Astronomy

1

Gamma Ray Astronomy, Gamma Ray Spectra, High Energy Interactions, Seyfert Galaxies, X Ray Astronomy, X Ray Spectra, Astronomical Models, Compton Effect, Cosmic Rays, Gamma Ray Observatory, Red Shift, Rosat Mission

Scientific paper

Recent oriented scintillation spectrometer experiment (OSSE) observations of sift gamma-ray emission from radio-quiet Seyfert galaxies as well as their theoretical implications are reviewed. For some Seyferts, the OSSE data can be combined with X-ray data from Ginga and ROSAT. Seyfert 1s have intrinsic power-law spectra with approximately 0.9 extending without a break to at least approximately 200 keV. There is some evidence for a break at higher energies. On top of this intrinsic spectrum there is a Compton reflection component, which corresponds to cold matter covering a approximately 2 pi solid angle as seen by the power-law source. Compton reflection is responsible for a hardening of the spectrum in the approximately 5-30 keV range and a softening at approximately 30-200 keV. This spectrum is then absorbed by a partially ionized external medium. The spectra of Seyfert 2s are marginally consistent with those of Seyfert 1s modified by strong absorption. However, there are indications that their intrinsic X-ray spectra are harder than those of Seyfert 1s. This is in fact the case for NGC 4151, a Seyfert 1.5. The Seyfert spectra integrated over redshift with cosmological evolution can explain the cosmic X-ray background spectrum from 1 to 100 keV.

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