Soft X-Ray and Extreme Ultraviolet Excess Emission from Clusters of Galaxies |
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| Authors: | F Durret J S Kaastra J Nevalainen T Ohashi N Werner |
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| Institution: | (1) Institut d’Astrophysique de Paris, CNRS, UMR 7095, Université Pierre et Marie Curie, 98bis Bd Arago, 75014 Paris, France;(2) SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands;(3) Astronomical Institute, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands;(4) Observatory, University of Helsinki, P.O. Box 14, 00014 Helsinki, Finland;(5) Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Tokyo 192-0397, Japan;(6) Max-Planck-Institute für Astrophysik, Karl-Schwarzschild-Strasse 1, 85749 Garching, Germany |
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| Abstract: | 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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| Keywords: | Galaxies: clusters X-ray: spectra |
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