Journal
JOURNAL OF ASTROPHYSICS AND ASTRONOMY
Volume 32, Issue 4, Pages 519-527Publisher
INDIAN ACAD SCIENCES
DOI: 10.1007/s12036-011-9117-1
Keywords
Galaxy: clusters: general; radio continuum: general; X-rays: general; radiation mechanisms: non-thermal
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We discuss the statistical properties of the radio halo population in galaxy clusters. Radio bi-modality is observed in galaxy clusters: a fraction of clusters host giant radio halos while a majority of clusters do not show evidence of diffuse cluster-scale radio emission. The radio bi-modality has a correspondence in terms of dynamical state of the hosting clusters showing that merging clusters host radio halos and follow the well-known radio-X-ray correlation, while more relaxed clusters do not host radio halos and populate a region well separated from that correlation. These evidences can be understood in the framework of a scenario where merger-driven turbulence re-accelerate the radio emitting electrons. We discuss the main statistical expectations of this scenario underlining the important role of the upcoming LOFAR surveys to test present models.
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