The quasar epoch and the stellar ages of early-type galaxies

Abstract

We investigate the hypothesis that quasars formed together with the stellar populations of early-type galaxies. This hypothesis, in conjunction with the stellar ages of early-type galaxies from population synthesis models, the relation of black hole mass to bulge velocity dispersion, and the velocity dispersion distribution from the Sloan Digital Sky Survey, completely determines the cosmic accretion hystory of supermassive black holes and the redshift evolution of the characteristic luminosity. On the other hand the precise shape of the luminosity function of quasars depends on the light curve of quasars and, in the optical, but not so much in X-rays, on the covering factor of the dust surrounding the AGN. We find a plausible set of assumptions for which the coeval formation of supermassive black holes and elliptical galaxies is in good agreement with the observed B-band and X-ray luminosity functions of quasars.

arXiv comment8 pages, 5 figures, accepted for publication in MNRAS

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