Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983liaco..24..468k&link_type=abstract
IN: Quasars and gravitational lenses; Proceedings of the Twenty-fourth Liege International Astrophysical Colloquium, Cointe-Ougr
Astronomy and Astrophysics
Astronomy
Accretion Disks, Black Holes (Astronomy), Gamma Ray Astronomy, Quasars, Active Galactic Nuclei, Background Radiation, Electron-Positron Pairs, Energy Spectra, Milky Way Galaxy
Scientific paper
Hot accretion disks around massive, rotating black holes could exist in the centers of quasars. These hot accretion disks produce copious amounts of e+e- pairs, gamma-rays and X-rays. Most of the disk models that produce significant amounts of gamma-rays, say ⪆10% of the total luminosity, and have an energy flux spectral index at X-rays of order unity, are optically thick to gamma-gamma pair production. Gamma-rays, therefore, more energetic than a few MeV do not escape from the disk but are degraded to lower energy radiation. The authors explore the application of their picture to specific high-energy spectra of active galactic nuclei and quasars as well as the high-energy background. A hot accretion disk around a stellar black hole may also account for the positron source in the center of the Milky Way.
Eilek J. a.
Kafatos Menas
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