Diffuse Radio Emission in Galaxy Clusters postprint

Abstract: Galaxy clusters are the largest self-gravitationally bound systems in the Universe. Their diffuse radio emission is synchrotron radiation generated by non-thermal electrons moving in the magnetic field, and can be mainly classified into radio halos, radio mini-halos and radio relics. Radio halos occur mostly in merging clusters, and their origin is thought to be described by the merger-induced turbulent reacceleration model. Radio mini-halos are of small number and mainly found in relaxed cool-core clusters. Their origin can also be described by the turbulent reacceleration model, except that the turbulence is induced by gas sloshing in the cluster’s core. Radio relics are polarized sources mostly found in clusters’ periphery. They trace merger-induced shock waves. Finally, a larger and deeper survey of diffuse cluster radio sources in the era of LOFAR 2.0 and SKA is discussed.