Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..379..213b&link_type=abstract
Cosmic Frontiers ASP Conference Series, Vol. 379, proceedings of the conference held 31 July-4 August 2006 at Durham University,
Physics
1
Scientific paper
The role of radio-loud active galactic nuclei (AGN) in continually re-heating the cooling gas in the haloes surrounding elliptical galaxies is investigated. The prevalence of radio-loud AGN activity amongst elliptical galaxies is found to scale strongly with the mass of the central black hole (as M_{BH}^{1.6}). Combining this result with estimates of the mechanical energy output of these radio sources, the time-averaged energy output associated with recurrent radio source activity is derived: for elliptical galaxies of all masses, this is shown to balance the radiative energy losses from the hot gas surrounding the galaxy. Recurrent radio-loud AGN activity may therefore provide a self-regulating feedback mechanism capable of controlling the rate of growth of galaxies.
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