A Simple Black Hole Model of Quasar Abundance and Evolution in the Infinitely Long Cosmic-String Scheme

Details A Simple Black Hole Model of Quasar Abundance and Evolution in the Infinitely Long Cosmic-String Scheme A Simple Black Hole Model of Quasar Abundance and Evolution in the Infinitely Long Cosmic-String Scheme

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...462..601h&link_type=abstract

Astrophysical Journal v.462, p.601

Physics

1

Cosmic Strings, Cosmology: Theory, Galaxies: Fundamental Parameters, Galaxies: Quasars: General, Black Hole Physics

Scientific paper

The formation and evolution of quasars are investigated in relation to the infinitely long cosmic-string scheme. Using the mass function of high-density sites of cold dark matter in the cosmic-string model, a simple black hole model for the evolution of quasar abundance and luminosity function is developed by assuming an appropriate gas accretion rate into the central black holes. To compare with the observations, we apply statistical methods, assuming a Gaussian distribution, to the formation epoch of quasar host galaxies z_G_, to the mass fraction F of host-galaxy-fueling central black holes, and to the radiative efficiency ɛ, respectively. There is a time lag between the formation of host galaxies and the birth of high-redshift quasars. The simulated results with reasonable parameter values are in good agreement with the observed evolution of quasar abundance and luminosity function. It is necessary to have enough nonlinear regions for host galaxies at around z ~ 7 to adequately reproduce the observations.

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