Observations of extended radio emission in clusters

Details Observations of extended radio emission in clusters Observations of extended radio emission in clusters

2008-01-07

arxiv.org/abs/0801.0985v1

Astronomy and Astrophysics

Astrophysics

27 pages, 7 figures, accepted for publication in Space Science Reviews, special issue "Clusters of galaxies: beyond the therma

Scientific paper

10.1007/s11214-008-9311-x

We review observations of extended regions of radio emission in clusters; these include diffuse emission in `relics', and the large central regions commonly referred to as `halos'. The spectral observations, as well as Faraday rotation measurements of background and cluster radio sources, provide the main evidence for large-scale intracluster magnetic fields and significant densities of relativistic electrons. Implications from these observations on acceleration mechanisms of these electrons are reviewed, including turbulent and shock acceleration, and also the origin of some of the electrons in collisions of relativistic protons by ambient protons in the (thermal) gas. Improved knowledge of non-thermal phenomena in clusters requires more extensive and detailed radio measurements; we briefly review prospects for future observations.

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