The Cosmic Density of Massive Black Holes from Galaxy Velocity Dispersions | Zendy

M. C. Aller | Zendy; D. O. Richstone | Zendy

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The Cosmic Density of Massive Black Holes from Galaxy Velocity Dispersions

Author(s) -

M. C. Aller,

D. O. Richstone

Publication year - 2002

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/344484

Subject(s) - supermassive black hole , physics , astrophysics , quasar , redshift , black hole (networking) , hubble's law , galaxy , intermediate mass black hole , bulge , velocity dispersion , stellar black hole , cosmic cancer database , astronomy , computer network , routing protocol , routing (electronic design automation) , computer science , link state routing protocol

Supermassive black holes are thought to be relics of quasars, and theirnumbers and masses are therefore related to the quasar luminosity function andits evolution with redshift. We have used the relationship between black holemass and bulge velocity dispersion (the M_bullet - sigma relation) to make animproved estimate of the mass density and mass spectrum of supermassive blackholes. Uncertainties in the M_bullet - sigma relation have little effect on themass density. We find a mass density of (4.8 +/- 1.6) h^2 x 10^5 M_sun Mpc^-3.Some of the variance in published density estimates comes from the use ofdifferent values of the Hubble constant.Comment: To appear in the December 2002 issue of The Astronomical Journa

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