Remnants of the quasars

Details Remnants of the quasars Remnants of the quasars

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..421c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 3, p. 421-424.

Astronomy and Astrophysics

Astronomy

141

Black Holes (Astronomy), Galactic Nuclei, Quasars, Active Galaxies, Cosmology

Scientific paper

Assuming a standard black hole accretion model for quasars, we estimate the present total mass density, rhoBH, of quasar remnants using recent observations of quasar populations and of typical quasar spectra over a wide wavelength range. We find rhoBH of greater than about (1.4-2.2) x 10 exp 5 solar masses/cu Mpc for a quasar radiative efficiency of 0.1. This is an upward revision by a factor of 3.0-4.6 from a decade-old estimate by Soltan (1982). A typical bright galaxy is thus expected to contain a central black hole of greater than about 10 exp 7/cu h solar masses. Furthermore, we expect that greater than about 50 percent of rhoBH is contributed by objects of mass greater than about 10 exp 8/sq h solar masses and greater than about 10 percent by those more massive than about 6 x 10 exp 8/sq h solar masses.

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