NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-16 T01:12:50 PDT
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For refcode 1989A&A...209...27P:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1989A&A...209...27P The evolution of the Eddington ratio for active galactic nuclei P. Padovani Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA Dipartimento di Astronomia, Universita di Padova, Italy Received June 3, accepted August 5, 1988 Summary. Masses, bolometric luminosities and Eddington ratios are derived for a sample of 138 active galactic nuclei with redshift between 0.002 and 3.5. After a careful examination of the assumptions involved, the constancy of the Eddington ratio with redshift is excluded at a high degree of confidence, using a partial correlation analysis to subtract the dependence of both quantities on luminosity and to avoid selection effects: the majority of the high redshift quasars (z~2.2) are super-Eddington and have an Eddington ratio which is at least one order of magnitude greater than that of local Seyfert 1 galaxies. Key words: galaxies: active - quasars: general - Eddington ratio - accretion
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