Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125...52b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 1, Aug. 1983, p. 52-58.
Astronomy and Astrophysics
Astronomy
74
Active Galactic Nuclei, Black Holes (Astronomy), Eddington Approximation, Luminosity, Active Galaxies, Astronomical Models, Bl Lacertae Objects, Quasars, Seyfert Galaxies
Scientific paper
Analysis of the variability timescale-bolometric luminosity relation for active galaxies, including Seyferts, Quasars, and BL Lac objects, shows that a number of sources 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 contemporary black hole accretion models. Most of the objects which satisfy this luminosity limit are therefore compatible with the existence of massive black holes at this nuclei. It is found, for the remaining objects, that the violation of this limit is removed if a closed Universe with a value of H0 of approximately 100 km/s mpc is assumed. These results are discussed in the light of the high gamma-ray luminosities suggested by recent observations of active galaxies.
Bassani Loredana
Dean Anthony J.
Sembay Steve
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