Proceedings of The Riddle of Cooling Flows in Galaxies and Clusters of Galaxies, May 31 - June 4, 2003, Charlottesville, Virginia, USA, Ed. T. H. Reiprich, J. C. Kempner, & N. Soker

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Abstract. Recent observations of the interactions between radio sources and the X-ray-emitting gas in cooling flows in the cores of clusters of galaxies are reviewed. The radio sources inflate bubbles in the X-ray gas, which then rise buoyantly outward in the clusters transporting energy to the intracluster medium (ICM). The bright rims of gas around the radio bubbles are cool, rather than hot, and do not show signs of being strongly shocked. Energy deposited into the ICM over the lifetime of a cluster through several outbursts of a radio source helps to account for at least some of the gas that is missing in cooling flows at low temperatures.

Table of Contents

• INTRODUCTION
• Chandra OBSERVATIONS OF BUBBLES AND TEMPERATURE STRUCTURE
• EVIDENCE OF SHOCK HEATING IN GALAXIES
• PRESSURE IN X-RAY SHELLS
• BUOYANTLY RISING BUBBLES
• INTERMEDIATE CASES
• ENTRAINMENT OF COOL GAS
• CAN RADIO SOURCES OFFSET THE COOLING IN COOLING FLOWS?
• CONCLUSIONS
• REFERENCES