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Published online by Cambridge University Press: 14 August 2015
Gaseous matter almost certainly cannot account for a significant amount of the binding mass in the cores of rich clusters. Implications of the variety of upper limits are well known (Tarter and Silk 1974), and will not be described here. However intracluster gas provides important clues to the evolution of galaxy clusters, and the present review is devoted to elucidating its role.