Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-03
Mon.Not.Roy.Astron.Soc.378:198-210,2007
Astronomy and Astrophysics
Astrophysics
10 pages of text plus 5 of figs and refs. MNRAS, accepted.
Scientific paper
10.1111/j.1365-2966.2007.11770.x
We provide a new estimate of the local supermassive black hole mass function using (i) the empirical relation between supermassive black hole mass and the Sersic index of the host spheroidal stellar system and (ii) the measured (spheroid) Sersic indices drawn from 10k galaxies in the Millennium Galaxy Catalogue. The observational simplicity of our approach, and the direct measurements of the black hole predictor quantity, i.e. the Sersic index, for both elliptical galaxies and the bulges of disc galaxies makes it straightforward to estimate accurate black hole masses in early- and late-type galaxies alike. We have parameterised the supermassive black hole mass function with a Schechter function and find, at the low-mass end, a logarithmic slope (1+alpha) of ~0.7 for the full galaxy sample and ~1.0 for the early-type galaxy sample. Considering spheroidal stellar systems brighter than M_B = -18 mag, and integrating down to black hole masses of 10^6 M_sun, we find that the local mass density of supermassive black holes in early-type galaxies rho_{bh, early-type} = (3.5+/-1.2) x 10^5 h^3_{70} M_sun Mpc^{-3}, and in late-type galaxies rho_{bh, late-type} = (1.0+/-0.5) x 10^5 h^3_{70} M_sun Mpc^{-3}. The uncertainties are derived from Monte Carlo simulations which include uncertainties in the M_bh-n relation, the catalogue of Sersic indices, the galaxy weights and Malmquist bias. The combined, cosmological, supermassive black hole mass density is thus Omega_{bh, total} = (3.2+/-1.2) x 10^{-6} h_70. That is, using a new and independent method, we conclude that (0.007+/-0.003) h^3_{70} per cent of the universe's baryons are presently locked up in supermassive black holes at the centres of galaxies.
Allen Paul D.
Driver Simon. P.
Graham Alister W.
Liske Jochen
No associations
LandOfFree
The Millennium Galaxy Catalogue: The local supermassive black hole mass function in early- and late-type galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Millennium Galaxy Catalogue: The local supermassive black hole mass function in early- and late-type galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Millennium Galaxy Catalogue: The local supermassive black hole mass function in early- and late-type galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-255667