Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-30
Begelman, M. C., in Gas & Galaxy Evolution, ASP Conference Series Vol. 240, J.E. Hibbard, M.P. Rupen and J.H. van Gorkom, eds.
Astronomy and Astrophysics
Astrophysics
6 pages, 3 figures. Appeared in Gas & Galaxy Evolution, ASP Conference Series Vol. 240, 2001, p. 363. Referred to in astro-ph/
Scientific paper
The time- and ensemble-averaged mechanical energy outputs of radio galaxies may be large enough to offset much of the cooling inferred from X-ray observations of galaxy clusters. But does this heating actually counterbalance the cooling, diminishing cooling flows or quenching them altogether? I will argue that energy injection by radio galaxies may be important even in clusters where no active source is present, due to the likely intermittency of the jets. If the energy injected by radio galaxies percolates through the intracluster medium without excessive mixing, it could stabilize the atomic cooling responsible for X-ray emission.
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