Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icrc....1...85b&link_type=abstract
IN: International Cosmic Ray Conference, 18th, Bangalore, India, August 22-September 3, 1983, Conference Papers. Volume 1 (A85-2
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, Black Holes (Astronomy), Gamma Ray Astronomy, Astronomical Models, Bl Lacertae Objects, Gamma Ray Absorption, Luminosity, Quasars, Seyfert Galaxies, Stellar Mass Accretion
Scientific paper
Recent gamma-ray observations of active galaxies suggest that the major fraction of the total luminosity is emitted in the high energy region of the electromagnetic spectrum. Analysis of the variability timescale - bolometric luminosity relation for about sixty objects, including Seyferts, Quasars and BL Lacs, shows that a number of active galaxies violate the classical Eddington limit. A more realistic formulation of this limit, which takes into account the effects of beaming and/or decreasing scattering cross-section as evaluated from the Klein-Nishina relationship, is discussed in the context of Black Hole accretion models for active galaxies. The absorption of gamma-rays in active nuclei is also considered.
Bassani Loredana
Dean Anthony J.
Sembay Steve
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