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

Creators: Giodini, S.; Smolčić, V.; Finoguenov, A.; Boehringer, H.; Bîrzan, L.; Zamorani, G.; Oklopčić, A.; Pierini, D.; Pratt, G. W.; Schinnerer, E.; Massey, R.; Koekemoer, A. M.; Salvato, M.; Sanders, D. B.; Kartaltepe, J. .S.; Thompson, D.

Abstract

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-raydetected 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.

Additional Information

© 2010 The American Astronomical Society. Received 2009 October 30; accepted 2010 February 19; published 2010 April 8. S.G. acknowledges support by the DFG Cluster of Excellence "Origin and Structure of the universe" (http://www.universecluster.de). S.G. thanks A. Merloni for helpful comments. V.S. acknowledges support from the Owens Valley Radio Observatory, which is supported by the National Science Foundation through grant AST-0838260. V.S. and A.O. thank Unity through Knowledge Fund (http://www.ukf.hr) for collaboration support through the "Homeland Visit" grant. A.O. thanks California Institute of Technology for generous support through NASA grants 1292462 and 1344606. We acknowledge the contributions of the entire COSMOS collaboration; more informations on the COSMOS survey are available at http://www.astro.caltech.edu/∼cosmos. The authors acknowledge the National Radio Astronomy Observatory for support. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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