SIMBAD references

2009MNRAS.395.2317P - Mon. Not. R. Astron. Soc., 395, 2317-2325 (2009/June-1)

Observable consequences of kinetic and thermal AGN feedback in elliptical galaxies and galaxy clusters.


Abstract (from CDS):

We have constructed an analytical model of active galactic nuclei (AGN) feedback and studied its implications for elliptical galaxies and galaxy clusters. The results show that momentum injection above a critical value will eject material from low-mass elliptical galaxies, and leads to an X-ray luminosity, LX, that is ∝ σ8–10, depending on the AGN fuelling mechanism, where σ is the velocity dispersion of the hot gas. This result agrees well with both observations and semi-analytic models. In more massive ellipticals and clusters, AGN outflows quickly become buoyancy dominated. This necessarily means that heating by a central cluster AGN redistributes the intracluster medium (ICM) such that the mass of hot gas, within the cooling radius, should be ∝ LX(< rcool)/[g(rcool)σ], where g(rcool) is the gravitational acceleration at the cooling radius. This prediction is confirmed using observations of seven clusters. The same mechanism also defines a critical ICM cooling time of ∼0.5Gyr, which is in reasonable agreement with recent observations showing that star formation and AGN activity are triggered below a universal cooling time threshold.

Abstract Copyright: © 2009 The Author. Journal compilation © 2009 RAS

Journal keyword(s): hydrodynamics - galaxies: active - galaxies: clusters: general - cooling flows - galaxies: elliptical and lenticular, cD

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Simbad objects: 7

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