The BH mass evolution of quasars from the SLOAN survey

Details The BH mass evolution of quasars from the SLOAN survey The BH mass evolution of quasars from the SLOAN survey

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agn8.confe..18l&link_type=abstract

Proceedings of the 8th National Conference on AGN, held in Torino, Italy, May 19-22, 2008. Edited by L. Lanteri, C.M. Raiteri,

Computer Science

Scientific paper

Starting from the 60000 quasars of the SLOAN sample for which line width and monochromatic flux are available, we test the validity of the virial assumption to evaluate BH masses. Radio loud and radio quiet quasar subsamples are compared in terms of different FWHM and luminosity distributions, finding that at low redshift RLQs have on average broader lines and higher luminosities than RQQs, and consequently higher masses. This trend is not apparent at higher redshift. We then study the evolution of the BH mass with redshift. As the sample is dominated by selection biases, we propose an approach based on Monte Carlo simulations. We focus on the observed distribution in the FWHM-luminosity plane, which for the lowest redshift sample can be simulated assuming very simple distributions of M_BH, Eddington ratios and luminosity. The observed distributions at the higher redshifts can be reconstructed assuming an evolution of the quasar number density, of the maximum mass and of the Eddington factors.

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