Accretion Rates and the Accretion Efficiency in AGNs

Details Accretion Rates and the Accretion Efficiency in AGNs Accretion Rates and the Accretion Efficiency in AGNs

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasj...55..599b&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.55, No.3, pp. 599-603

Astronomy and Astrophysics

Astronomy

6

Accretion: Accretion Disks, Galaxies: Active, Galaxies: Nuclei, Galaxies: Seyfert

Scientific paper

We used the standard geometrical-thin accretion theory to obtain the accretion rates in Seyfert 1 galaxies and quasars. Combining the accretion rates with the bolometric luminosity, we obtained the accretion efficiency. We found that most Seyfert 1 galaxies and radio-quiet quasars have lower accretion efficiencies, while most radio-loud quasars possess higher accretion efficiencies. This finding further implies that most of the radio-loud quasars possess Kerr black holes, while Seyfert 1 galaxies and radio-quiet quasars may not possess Kerr black holes. Considering the difference in the accretion efficiency, we found that there is a strong correlation between the accretion rate in units of the Eddington accretion rate and the width of the Hβ emission line, and that most AGNs are not accreting at super-Eddington rates.

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