The importance of radio sources in accounting for the highest mass black holes

Details The importance of radio sources in accounting for the highest mass black holes The importance of radio sources in accounting for the highest mass black holes

1999-09-09

arxiv.org/abs/astro-ph/9909163v1

New Astron.Rev. 46 (2002) 211-214

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. To appear in "Lifecycles of Radio Galaxies", ed J. Biretta et al., New Astronomy Reviews

Scientific paper

10.1016/S1387-6473(01)00182-8

The most massive black holes lie in the most massive elliptical galaxies, and at low-z all radio-loud AGNs lie in giant ellipticals. This strongly suggests a link between radio-loudness and black hole mass. We argue that the increase in the radio-loud fraction with AGN luminosity in optically-selected quasar samples is consistent with this picture. We also use the ratio of black holes today to quasars at z~2 to conclude that the most bolometrically-luminous AGN, either radio-loud or radio quiet, are constrained to have lifetimes <~10^8 yr. If radio sources are associated with black holes of >~10^9 M_sun at all redshifts, then the same lifetime constraint applies to all radio sources with luminosities above L_5GHz ~ 10^24 W/Hz/sr.

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