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Soft X-ray and extreme ultraviolet excess emission from clusters of galaxies

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arxiv 0801.0977 v1 pith:QPM4IHFZ submitted 2008-01-07 astro-ph

classification astro-ph
keywords excesssoftemissionx-rayclustersextremegalaxiesnumber
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An excess over the extrapolation to the extreme ultraviolet and soft X-ray ranges of the thermal emission from the hot intracluster medium has been detected in a number of clusters of galaxies. We briefly present each of the satellites (EUVE, ROSAT PSPC and BeppoSAX, and presently XMM-Newton, Chandra and Suzaku) and their corresponding instrumental issues, which are responsible for the fact that this soft excess remains controversial in a number of cases. We then review the evidence for this soft X-ray excess and discuss the possible mechanisms (thermal and non-thermal) which could be responsible for this emission.

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