Cold Fronts and Shocks Formed by Gas Streams in Galaxy Clusters
  Cold Fronts and shocks are hallmarks of the complex intra-cluster medium
(ICM) in galaxy clusters. They are thought to occur due to gas motions within
the ICM and are often attributed to galaxy mergers within the cluster. Using
hydro-cosmological simulations of clusters of galaxies, we show that collisions
of inflowing gas streams, seen to penetrate to the very centre of about half
the clusters, offer an additional mechanism for the formation of shocks and
cold fronts in cluster cores. Unlike episodic merger events, a gas stream
inflow persists over a period of several Gyrs and it could generate a
particular pattern of multiple cold fronts and shocks.
