Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1780326 | New Astronomy Reviews | 2006 | 4 Pages |
Abstract
We present the results of a study which uses the 3CRR sample of radio-loud active galactic nuclei (AGN) to investigate the evolution of the black-hole:spheroid relation in the most massive early-type galaxies from 0 < z < 2. Radio-loud unification is exploited to obtain virial (line-width) black-hole mass estimates from the 3CRR quasars, and stellar mass estimates from the 3CRR radio galaxies, thereby providing black-hole and stellar mass estimates for a single population of early-type galaxies. At low redshift (z < 1) the 3CRR sample is consistent with a black-hole:spheroid ratio of Mbh/Msph â 0.002, in good agreement with that observed locally for quiescent galaxies of similar stellar mass (Msph â 5 Ã 1011Mâ). However, the 3CRR black-hole:spheroid ratio is found to evolve as Mbh/Msph â (1 + z)2.07±0.76, reaching Mbh/Msph â 0.008 by redshift z â 2, providing further evidence that, at least for massive early-type galaxies, the growth of the central supermassive black-hole may be completed before that of the host spheroid.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Astronomy and Astrophysics
Authors
R.J. McLure, M.J. Jarvis, T.A. Targett, J.S. Dunlop, P.N. Best,