SMBH Mass Function from Velocity Dispersion and Luminosity

Details SMBH Mass Function from Velocity Dispersion and Luminosity SMBH Mass Function from Velocity Dispersion and Luminosity

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..380..565t&link_type=abstract

At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys ASP Conference Series, Vol. 380, proceedings o

Astronomy and Astrophysics

Astronomy

Scientific paper

Black hole masses are tightly correlated with the stellar velocity dispersion of host galaxies, and slightly less-well correlated with the bulge luminosities. There is still debate on which of these predictors can better reproduce the local black hole mass function when coupled with an appropriate distribution function: the M_\bullet-σ relation predicts fewer massive black holes than does the M_\bullet-L relation. This is because the L-σ in black hole samples currently available 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 towards objects with abnormally large σ for their luminosities. Assuming that the bias is a selection rather than physical effect, then the M_\bullet-σ and M_\bullet-L relations currently in the literature are also biased from their intrinsic values. Our analysis suggests that the bias in the M_\bullet-σ relation is likely to be small, whereas the M_\bullet-L relation is biased towards predicting more massive black holes for a given luminosity. If this is the case, the velocity dispersion-based estimate of the intrinsic local supermassive black hole mass function is more reliable.

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