Central Black Hole Growth in Galaxies: Normal, Active, and Merging

Details Central Black Hole Growth in Galaxies: Normal, Active, and Merging Central Black Hole Growth in Galaxies: Normal, Active, and Merging

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733525h&link_type=abstract

American Astronomical Society, AAS Meeting #217, #335.25; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

The mass ratio of central black holes to galaxy bulges is not constant but grows over the lifetime of the galaxies. While other groups have looked at changes over cosmic time or with galaxy mass, we show a dependence on the time since the last major galactic merger.
* E and S0 galaxies in groups and clusters (but not field galaxies) show an early, steep rise in mass ratio that becomes slower in old galaxies. Additional work is underway to separate truly isolated galaxies from fossil groups (those that have merged with all companions), which would be expected to show the growth pattern.
* Both radio and optical AGN show different patterns from normal galaxies. All AGN have high black hole/bulge mass ratios, regardless of age, but radio AGN have the highest mass ratios and are skewed towards older galaxies.
* Time is measured by the age of a galaxy's dominant stellar population, which is expected to measure time since the last major galactic merger. Thus activity showing up in "old" galaxies would have to be triggered by minor mergers (without producing a burst of star formation) or other events, such as disk and bar instabilities. These results allow us to test galaxy evolution models.

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