Other
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238...87g&link_type=abstract
Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #
Other
Scientific paper
While black holes (BHs) are apparently a ubiquitous component of the nuclei of local spheroids, their role in galaxy evolution remains largely unknown. The tight correlations between galaxy spheroid properties and BH mass provide important boundary conditions for models of the coevolution of BHs and galaxies. Here we consider another important boundary condition: the local mass function of broad-line active galaxies. We use standard virial mass estimation techniques to examine the distribution of BH masses and accretion rates for active galaxies in the local universe. Comparisons with local galaxy luminosity functions and star-formation rate distributions allow us to compare average current growth rates of galaxies and BHs as a function of mass. We also compare the distribution of BH masses in local broad and narrow-line objects, and find that both populations have a characteristic mass of ˜107 Msun. Most importantly, this is the first BH mass function to consider BH with masses below 106 Msun. The space density of this important population allows us to place constraints on potential mechanisms for the creation of seed BHs in the early universe.
Greene Jenny E.
Ho Luis C.
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