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We utilize cosmological simulations of 16 galaxy clusters at redshifts\zeq{0} and \zeq{0.6} to study the effect of inflowing streams on theproperties of the X-ray emitting intracluster medium. We find that the massaccretion occurs predominantly along streams that originate from the cosmic weband consist of heated gas. Clusters that are unrelaxed in terms of their X-raymorphology are characterized by higher mass inflow rates and deeper penetrationof the streams, typically into the inner third of the virial radius. Thepenetrating streams generate elevated random motions, bulk flows and coldfronts. The degree of penetration of the streams may change over time such thatclusters can switch from being unrelaxed to relaxed over a time-scale ofseveral giga years.

The Role of Penetrating Gas Streams in Setting the Dynamical State of Galaxy Clusters