The heating of gas in a galaxy cluster by X-ray cavities and large-scale shock fronts

B. R. McNamara (), P. E. J. Nulsen, M. W. Wise, D. A. Rafferty, C. Carilli, C. L. Sarazin and E. L. Blanton
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B. R. McNamara: Ohio University, Clippinger Laboratories
P. E. J. Nulsen: Harvard-Smithsonian Center for Astrophysics
M. W. Wise: MIT Center for Space Research
D. A. Rafferty: Ohio University, Clippinger Laboratories
C. Carilli: National Radio Astronomy Observatory, Very Large Array
C. L. Sarazin: University of Virginia
E. L. Blanton: University of Virginia

Nature, 2005, vol. 433, issue 7021, 45-47

Abstract: Galactic clusters on heat Astronomers using the latest generation of orbiting X-ray observatories are making some surprising discoveries, one of which is the relatively slow rate of cooling of gas in the cores of galaxy clusters. The Chandra X-ray observatory is now routinely observing giant cavities in the centre of galaxy clusters, and these may hold the key to this phenomenon. The gaseous halo of the galaxy cluster MS0735.6+7421 has been found to contain two such cavities, caused by interaction between a radio source and the hot gas surrounding it. This is producing the most powerful radio outburst known, and sufficient heat to counteract the expected cooling. The most likely power source is a supermassive black hole.

Date: 2005
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DOI: 10.1038/nature03202

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