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X/γ-rays from Active Galactic Nuclei

Published online by Cambridge University Press:  25 May 2016

R. Svensson
R. Svensson*
Affiliation:
Stockholm Observatory, SE-133 36 Saltsjöbaden, Sweden

Abstract

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Recent progress using RXTE and BeppoSAX to study the X/γ emission from radio-quiet active galactic nuclei, i.e., Seyfert galaxies, is reviewed. These satellites allow simultaneous broad-band spectra extending from 0.1–200 keV to be observed for the first time and allow the various spectral components to be determined with some certainty. In particular, the new observations support the unified model of Seyfert galaxies. Most importantly, it has been found that a large fraction of Seyfert 2 galaxies have Compton-thick tori surrounding their nuclei. Spectral transitions in Seyfert galaxies are discussed, as well as recent efforts trying to synthesize the cosmic X/γ-ray background. Finally, thermal Comptonization in these sources are discussed.

Type
Part I: Talks
Information
Symposium - International Astronomical Union , Volume 195: Highly Energetic Physical Processes and Mechanisms , 2000 , pp. 143 - 152
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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