Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 328, Issue 3, Pages 925-930Publisher
WILEY-BLACKWELL
DOI: 10.1046/j.1365-8711.2001.04919.x
Keywords
accretion, accretion discs; galaxies : active; galaxies : luminosity function, mass function
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We investigate the relationship between the present-day optical luminosity function of galaxies and the X-ray luminosity function of Seyfert 1s to determine the fraction of galaxies that host Seyfert 1 nuclei and their Eddington ratios. The local type 1 active galactic nuclei (AGN) X-ray luminosity function is well reproduced if similar to1 per cent of all galaxies are type 1 Seyferts which have Eddington ratios of similar to 10(-3). However, in such a model the X-ray luminosity function is completely dominated by AGN in E and S0 galaxies, contrary to the observed mix of Seyfert host galaxies. To obtain a plausible mix of AGN host galaxy morphologies requires that the most massive black holes in E and S0 galaxies accrete with lower Eddington ratios, or have a lower incidence of Seyfert activity, than the central black holes of later-type galaxies.
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