Black-hole masses are tightly correlated with the stellar velocity dispersion of host galaxies, and slightly less-well correlated with the bulge luminosities; the M• -σ relation predicts fewer massive black holes than does the M• -L relation. This is because the L-σ in currently available black-hole samples is inconsistent with that in the samples from which the distributions of L or σ are based. This suggests that current black-hole samples are biased and that the M• -σ and M• -L relations currently in the literature are also biased from their intrinsic values. Our analysis suggests that the bias in the M• -σ relation is likely to be small, whereas the M• -L relation is biased towards predicting more massive black holes for a given luminosity.
SMBH mass function from velocity dispersion and luminosity
TUNDO, ELENA;PIZZELLA, ALESSANDRO
2007
Abstract
Black-hole masses are tightly correlated with the stellar velocity dispersion of host galaxies, and slightly less-well correlated with the bulge luminosities; the M• -σ relation predicts fewer massive black holes than does the M• -L relation. This is because the L-σ in currently available black-hole samples is inconsistent with that in the samples from which the distributions of L or σ are based. This suggests that current black-hole samples are biased and that the M• -σ and M• -L relations currently in the literature are also biased from their intrinsic values. Our analysis suggests that the bias in the M• -σ relation is likely to be small, whereas the M• -L relation is biased towards predicting more massive black holes for a given luminosity.Pubblicazioni consigliate
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