Dynamical Collapse of the Intracluster Gas and the Formation of a Hot Plasma in Clusters of Galaxies

Physics

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Scientific paper

Dynamical collapse of the intracluster gas in clusters of galaxies is studied numerically by taking account of both the gravity of background galaxies and the self-gravity. The adiabatic case, the case with the thermal bremsstrahlung cooling and the case with both the heat conduction and thermal bremsstrahlung cooling have been calculated. In the first two cases, a hot plasma which is formed after the bounce reaches an equilibrium state if the initial density ρ0 is lower than a certain critical value. In the last case, the gas secularly contracts. The results are compared with X-ray observation of the Coma cluster.

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