In astronomy, the intracluster medium (ICM) is the superheated plasma present at the center of a galaxy cluster. This is gas heated to temperatures of between roughly 10 and 100 megakelvins and consisting mainly of ionised hydrogen and helium, containing most of the baryonic material in the cluster. The ICM strongly emits X-ray radiation.
Read more about Intracluster Medium: Heating, Composition, Observing, Cooling Flow
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