Hot bubbles from active galactic nuclei as a heat source in cooling-flow clusters

Marcus Brüggen () and Christian R. Kaiser
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Marcus Brüggen: International University Bremen
Christian R. Kaiser: University of Southampton

Nature, 2002, vol. 418, issue 6895, 301-303

Abstract: Abstract Hot, X-ray-emitting plasma permeates clusters of galaxies. The X-ray surface brightness often shows a peak near the centre of the cluster that is coincident with a drop in the entropy of the gas. This has been taken as evidence for a ‘cooling flow’, where the gas cools by radiating away its energy, and then falls to the centre1. Searches for this cool gas have revealed significantly less than predicted2, indicating that the mass deposition rate is much lower than expected. Most clusters with cooling flows, however, also host an active galactic nucleus at their centres3. These active galactic nuclei can inflate large bubbles of hot plasma that subsequently rise through the cluster ‘atmosphere’, thus stirring the cooling gas4,5 and adding energy. Here we report highly resolved hydrodynamic simulations which show that buoyant bubbles increase the cooling time in the inner regions of clusters and significantly reduce the deposition of cold gas.

Date: 2002
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DOI: 10.1038/nature00857

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