On the Origin and Evolution of the Intracluster Gas: Interaction with Galaxies

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Abstract
The origin and evolution of hot intracluster gas are investigated in the light of the interactions with interstellar gas in cluster galaxies. After the formation of the hot intracluster gas through the infall of primordial gas, the interstellar gas is swept out of galaxies and mixed into the intracluster gas by the ram pressure and/or the evaporation due to the heat conduction. Emerging conditions of interstellar gas by these processes and thermal evolution of intracluster gas are examined under a simple model. Other theories on the formation of hot intracluster gas, such as the heating by multiple supernova explosions, are also examined critically. Some observational tests for or against these models are proposed.

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