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Astrophysics

Title: The local black-hole mass function from 2dFGRS radio galaxies

Abstract: Radio emission from early-type (E and S0) galaxies usually signals the presence of a central supermassive black hole. If radio luminosity and black-hole mass are correlated, then we can use the large sample of radio galaxies observed in the 2dF Galaxy Redshift Survey (2dFGRS) to estimate the local (z<0.1) black-hole mass function for early-type galaxies. Integrating over this mass function yields a local black-hole mass density of Rho_BH = 1.8 (+0.4, -0.6) x 10^5 solar mases/Mpc^3 (for Ho = 50 km/s/Mpc), in good agreement both with the local value derived from galaxy velocity dispersions and with the high-redshift value derived from QSOs. This supports earlier suggestions that local radio galaxies are the direct descendants of most or all of the high-redshift QSOs.
Comments: 6 pages, 3 figures. Published in Carnegie Observatories Astrophysics Series, Vol. 1: "Coevolution of Black Holes and Galaxies," ed. L.C. Ho (Pasadena: Carnegie Observatories, this http URL)
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0304514
  (or arXiv:astro-ph/0304514v1 for this version)

Submission history

From: Elaine M. Sadler [view email]
[v1] Tue, 29 Apr 2003 03:16:56 GMT (66kb)