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Advances in AstronomyVolume 2012 2012, Article ID 950641, 24 pages

Review Article

INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy

Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138, USA

INAF-Istituto di Radioastronomia di Bologna, Via Gobetti 101, 40129 Bologna, Italy

Dipartimento di Astronomia, Università di Bologna, Via Ranzani 1, 40127 Bologna, Italy

Physics and Astronomy Department, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 2G1

Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, ON, Canada N2L 2Y5

Received 29 July 2011; Accepted 14 September 2011

Academic Editor: Angela Bongiorno

Copyright © 2012 Myriam Gitti et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The current generation of flagship X-ray missions, Chandra and XMM-Newton, has changed our understanding of the so-called -cool-core- galaxy clusters and groups. Instead of the initial idea that the thermal gas is cooling and flowing toward the center, the new picture envisages a complex dynamical evolution of the intracluster medium ICM regulated by the radiative cooling and the nongravitational heating from the active galactic nucleus AGN. Understanding the physics of the hot gas and its interplay with the relativistic plasma ejected by the AGN is key for understanding the growth and evolution of galaxies and their central black holes, the history of star formation, and the formation of large-scale structures. It has thus become clear that the feedback from the central black hole must be taken into account in any model of galaxy evolution. In this paper, we draw a qualitative picture of the current knowledge of the effects of the AGN feedback on the ICM by summarizing the recent results in this field.





Author: Myriam Gitti, Fabrizio Brighenti, and Brian R. McNamara

Source: https://www.hindawi.com/



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