Journal
SPACE SCIENCE REVIEWS
Volume 134, Issue 1-4, Pages 93-118Publisher
SPRINGER
DOI: 10.1007/s11214-008-9311-x
Keywords
galaxies : clusters : general; galaxies : intergalactic medium; radio continuum : general; radiation mechanisms : non-thermal; magnetic fields; acceleration of particles
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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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