X-Ray Cavities and Cooling Flows

Details X-Ray Cavities and Cooling Flows X-Ray Cavities and Cooling Flows

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..307n&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

Scientific paper

Recent data have radically altered the X-ray perspective on cooling flow clusters. X-ray spectra show that very little of the hot intracluster medium is cooler than about 1 keV despite having short cooling times. In an increasing number of cooling flow clusters the lobes of a central radio source are found to have created cavities in the hot gas. The cavities are not overpressured relative to the intracluster gas but act as buoyant bubbles of radio emitting plasma that drive circulation as they rise mixing and heating the intracluster gas. All this points to the radio source i.e. an active galaxy as the heat source that prevents gas from cooling to low temperatures. However heating due to bubbles alone is insufficient so the energetics of cooling flows remain obscure. We review the data that leads to this picture and discuss the energetics and structure of cooling flows.

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