Radio Galaxy Feedback in X-ray-selected Groups from COSMOS: The Effect on the Intracluster Medium

Giodini, S. and Smolčić, Vernesa and Boehringer, H. and Bîrzan, L. and Zamorani, G. and Oklopčić, A. and Pierini, D. and Pratt, G. W. and Schinnerer, E. and Massey, R. and Koekemoer, A. M. and Salvato, M. and Sanders, D. B. and Kartaltepe, J. S. and Thompson, D. (2010) Radio Galaxy Feedback in X-ray-selected Groups from COSMOS: The Effect on the Intracluster Medium. Astrophysical Journal, 714 (1). pp. 218-228. ISSN 0004-637X

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We quantify the importance of the mechanical energy released by radio galaxies inside galaxy groups. We use scaling relations to estimate the mechanical energy released by 16 radio-active galactic nuclei located inside X-ray-detected galaxy groups in the COSMOS field. By comparing this energy output to the host groups' gravitational binding energy, we find that radio galaxies produce sufficient energy to unbind a significant fraction of the intragroup medium. This unbinding effect is negligible in massive galaxy clusters with deeper potential wells. Our results correctly reproduce the breaking of self-similarity observed in the scaling relation between entropy and temperature for galaxy groups.

Item Type: Article
Keywords: intergalactic medium, galaxies: active, galaxies: clusters: general, radio continuum: galaxies, X-rays: galaxies: clusters
Date: 2010
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © 2010 American Astronomical Society. Received 2009 October 30; accepted 2010 February 19; published 2010 April 8.
Divisions: Faculty of Science > Department of Physics
Publisher: IOP Publishing
Depositing User: Vernesa Smolčić
Date Deposited: 22 Apr 2015 08:04
Last Modified: 24 Feb 2016 15:40

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