The intracluster medium (ICM) is a hot, tenuous and X-ray emitting gas that pervades galaxy clusters. Meanwhile, extended synchrotron sources, i.e., radio relics and radio halos are frequently... Show moreThe intracluster medium (ICM) is a hot, tenuous and X-ray emitting gas that pervades galaxy clusters. Meanwhile, extended synchrotron sources, i.e., radio relics and radio halos are frequently observed in galaxy cluster, for which the two widely accepted particle acceleration are shock acceleration and turbulent acceleration, respectively. Both of these scenarios are due to ICM motions, which means that X-ray observations of the ICM are fundamental for quantifying shock wave and turbulence properties to test the acceleration models. This thesis focuses on X-ray observations of galaxy clusters, and covers topics from ICM shock - radio relic connection to turbulence - radio halo connection. The new observational evidences further support the two acceleration scenario. Show less
In this thesis, I studied the origin and evolution of the non-thermal radiation in merging galaxy clusters. Cluster mergers are the among the most energetic events in the Universe. Part of this... Show moreIn this thesis, I studied the origin and evolution of the non-thermal radiation in merging galaxy clusters. Cluster mergers are the among the most energetic events in the Universe. Part of this energy is released in turbulence and shock waves which can (re-)accelerate cosmic rays and amplify magnetic fields in the intra-cluster medium (ICM). The interaction of these results in large-scale synchrotron radiation, which is visible through radio observations. In addition, X-ray observations of the ICM were carried out to investigate the dynamical state of the clusters, and the properties of cluster shocks. Show less
In this thesis, I study the formation of large-scale structure and the physics of particle acceleration at large scales (~Mpc). The object of my study is clusters of galaxies that are... Show moreIn this thesis, I study the formation of large-scale structure and the physics of particle acceleration at large scales (~Mpc). The object of my study is clusters of galaxies that are in the formation process. Galaxy clusters form through a sequence of mergers of sub-clusters. During the formation of galaxy clusters, shocks and turbulence are generated in the intra-cluster medium (ICM). These shocks and turbulence (re-)accelerate cosmic ray (CR) particles to relativistic speeds. In the presence of magnetic fields, the CR particles emit synchrotron radiation that we can observe with radio telescopes. I also combine radio data with X-ray and optical data to study these clusters. Studies of these merging galaxy clusters help us to understand the physics of particle acceleration at cosmic scales Show less
