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2007MNRAS.379..894B - Mon. Not. R. Astron. Soc., 379, 894-908 (2007/August-2)
On the prevalence of radio-loud active galactic nuclei in brightest cluster galaxies: implications for AGN heating of cooling flows.
BEST P.N., VON DER LINDEN A., KAUFFMANN G., HECKMAN T.M. and KAISER C.R.
Abstract (from CDS):
It is argued that the radio-loud AGN properties of both BCGs and non-BCGs can naturally be explained if this activity is fuelled by cooling from hot gas surrounding the galaxy. Using observational estimates of the mechanical output of the radio jets, the time-averaged energy output associated with recurrent radio source activity is estimated for all group and cluster galaxies. Within the cooling radius of the cluster, the radio-mode heating associated with the BCG dominates over that of all other galaxies combined. The scaling between total radio-AGN energy output and cluster velocity dispersion is observed to be considerably shallower than the ∼σ4vscaling of the radiative cooling rate. Thus, unless either the mechanical-to-radio luminosity ratio or the efficiency of converting AGN mechanical energy into heating increases by 2-3 orders of magnitude between groups and rich clusters, radio-mode heating will not balance radiative cooling in systems of all masses. In groups, radio-AGN heating probably overcompensates the radiative cooling losses, and this may account for the observed entropy floor in these systems. In the most massive clusters, an additional heating process (most likely thermal conduction) may be required to supplement the AGN heating.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): galaxies: active - galaxies: clusters: general - cooling flows - radio continuum: galaxies - X-rays: galaxies: clusters
Simbad objects: 7
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