Gianfranco Brunetti

TL;DR: In this article, radio observations prove the existence of relativistic particles and magnetic field associated with the intra-cluster medium (ICM) through the presence of extended synchrotron emission in the form of radio halos and peripheral relics.

TL;DR: In this article, the relativistic electrons injected in the Coma cluster by some processes (starbursts, AGNs, shocks, turbulence) during a first phase in the past are systematically reaccelerated during a second phase for a relatively long time up to the present time.

TL;DR: The LOFAR Two-metre Sky Survey (LoTSS) as mentioned in this paper is a deep 120-168 MHz imaging survey that will eventually cover the entire northern sky, where each of the 3170 pointings will be observed for 8 h, which, at most declinations, is sufficient to produce ~5? resolution images with a sensitivity of ~100?Jy/beam and accomplish the main scientific aims of the survey, which are to explore the formation and evolution of massive black holes, galaxies, clusters of galaxies and large-scale structure.

TL;DR: In this paper, the relativistic electrons injected in the Coma cluster by some processes (starbursts, AGNs, shocks, turbulence) during a first phase were systematically reaccelerated during a second phase.

TL;DR: In this article, a simplified model of turbulence in clusters of galaxies focusing on the compressible motions was proposed to explain the nonthermal emission arising from galaxy clusters as a result of the re-acceleration of electrons by compressible turbulence induced by cluster mergers.