Cold fronts (CFs) 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 CFs in cluster cores. Unlike episodic merger events, a gas stream inflow persists over a period of several Gyr and it could generate a particular pattern of multiple CFs and shocks.
Bibliographical noteFunding Information:
We thank Neta Zinger for his assistance and advice. We thank the anonymous referee for comments and advice which improved the paper. This work was partly supported by the grants ISF 124/12, I-CORE Programme of the PBC/ISF 1829/12, BSF 2014-273, and NSF AST-1405962 and AST-1412768.
© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
- Galaxies: clusters: general
- Galaxies: clusters: intracluster medium