Black Hole Demography from Nearby Active Galactic Nuclei

Details Black Hole Demography from Nearby Active Galactic Nuclei Black Hole Demography from Nearby Active Galactic Nuclei

2004-01-24

arxiv.org/abs/astro-ph/0401527v1

Astronomy and Astrophysics

Astrophysics

To appear in Carnegie Observatories Astrophysics Series, Vol. 1: Coevolution of Black Holes and Galaxies, ed. L. C. Ho (Cambri

Scientific paper

A significant fraction of local galaxies show evidence of nuclear activity. I argue that the bulk of this activity, while energetically not remarkable, derives from accretion onto a central massive black hole. The statistics of nearby active galactic nuclei thus provide an effective probe of black hole demography. Consistent with the picture emerging from direct dynamical studies, the local census of nuclear activity strongly suggests that most, perhaps all, galaxies with a significant bulge component contain a central massive black hole. Although late-type galaxies appear to be generally deficient in nuclear black holes, there are important exceptions to this rule. I highlight two examples of dwarf, late-type galaxies that contain active nuclei powered by intermediate-mass black holes.

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