Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aipc..101..354k&link_type=abstract
IN: Positron-electron pairs in astrophysics; Proceedings of the Workshop, Greenbelt, MD, January 6-8, 1983 (A85-31276 13-90). Ne
Astronomy and Astrophysics
Astronomy
Accretion Disks, Black Holes (Astronomy), Galactic Cosmic Rays, Galactic Nuclei, Gamma Rays, X Ray Sources, Active Galactic Nuclei, Compton Effect, Eddington Approximation, Electron-Positron Pairs, Luminosity, Schwarzschild Metric
Scientific paper
Hot accretion disks around rotating black holes produce copious amounts of X-rays, gamma-rays and electron-positron pairs. These Comptonized models with an energy flux spectral index of the X-ray spectrum of about 1 are optically thick to gamma-gamma pair production. The resultant high energy spectrum steepens above a few MeV. The few gamma-ray spectra of active galactic nuclei that are available show this steepening as well as the gamma-ray diffuse background. The same processes that take place in a hot accretion disk around a supermassive black hole at the center of an active nucleus also operate in a hot accretion disk around a stellar mass black hole. The implications for the two galactic sources Cygnus X-1 and particularly the positron source at the galactic nucleus are examined.
Eilek J. a.
Kafatos Menas
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