Does AGN ``Feedback" in Galaxy Clusters Really Work?

Details Does AGN ``Feedback" in Galaxy Clusters Really Work? Does AGN ``Feedback" in Galaxy Clusters Really Work?

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..386..343d&link_type=abstract

Extragalactic Jets: Theory and Observation from Radio to Gamma Ray ASP Conference Series, Vol. 386, proceedings of the conferenc

Mathematics

Logic

3

Scientific paper

AGN ``feedback" has been employed for some time as a device to overcome the problems of galaxy mass functions predicted by ΛCDM cosmological models. Feedback has also been suggested as a means for solving the ``cooling flow" problem in galaxy clusters as well as a solution for the colors of BCGs in rich clusters. The key issue in such feedback models lies in the details of the energy transfer between the AGN outflow and ambient medium. For the case of galaxy clusters, we calculate the MHD evolution of AGN radio ``bubbles" in the ICM to estimate the mixing and energy transfer to the ICM. Magnetic effects inhibit mixing, and the use of such radio sources to reheat the ICM may not be as effective as has been proposed. In particular, the bubbles retain their basic structure for times of order 10^8 years, which is much longer than the mixing times obtained from purely hydrodynamic calculations.

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