Entropy Evolution of the Gas in Cooling Flow Clusters

Details Entropy Evolution of the Gas in Cooling Flow Clusters Entropy Evolution of the Gas in Cooling Flow Clusters

2003-09-18

arxiv.org/abs/astro-ph/0309513v1

Astronomy and Astrophysics

Astrophysics

Contribution to Proceedings of `The Riddle of Cooling Flows in Galaxies and Clusters of Galaxies', Charlottesville, VA, USA. M

Scientific paper

We emphasise the importance of the gas entropy in studying the evolution of cluster gas evolving under the influence of radiative cooling. On this basis, we develop an analytical model for this evolution. We then show that the assumptions needed for such a model are consistent with a numerical solution of the same equations. We postulate that the passive cooling phase ends when the central gas temperature falls to very low values. It follows a phase during which an unspecified mechanism heats the cluster gas. We show that in such a scenario the small number of clusters containing gas with temperatures below about 1 keV is simply a consequence of the radiative cooling.

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