Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...295l...1w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 295, Aug. 1, 1985, p. L1-L4.
Astronomy and Astrophysics
Astrophysics
80
Active Galactic Nuclei, Luminosity, Mass To Light Ratios, Quasars, Seyfert Galaxies, Active Galaxies, Bolometers, Correlation, Eddington Approximation, Least Squares Method
Scientific paper
The masses of the central sources in quasars and active galaxies are determined, assuming the H-beta line velocity widths are gravitationally induced, and using the H-beta luminosities to estimate the distances of the broad-line regions (BLR) from the central sources. It is found that the continuum luminosities are proportional to the masses thus determined. The average ratio of the optical continuum luminosity to the Eddington luminosity is 0.01, with a scatter of less than a factor of 3, over four orders of magnitude in luminosity. In addition, it is shown that the ratio of X-ray to H-beta luminosity, which in this picture is proportional to the ionization parameter, is anticorrelated with the total luminosity. This supports previous findings that the ionization parameter in the BLR of Seyfert nuclei is higher than that of quasars.
Wandel Amri
Yahil Amos
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