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Thermal Radiation Processes |
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| Authors: | J S Kaastra F B S Paerels F Durret S Schindler P Richter |
| Institution: | (1) SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands;(2) Astronomical Institute, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands;(3) Department of Astronomy, Columbia University, New York, NY, USA;(4) Institut d’Astrophysique de Paris, CNRS, UMR 7095, Université Pierre et Marie Curie, 98bis Bd Arago, 75014 Paris, France;(5) Institute for Astro- and Particle Physics, University of Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria;(6) Physics Institute, Potsdam University, Am Neuen Palais 10, 14469 Potsdam, Germany |
| Abstract: | We discuss the different physical processes that are important to understand the thermal X-ray emission and absorption spectra of the diffuse gas in clusters of galaxies and the warm-hot intergalactic medium. The ionisation balance, line and continuum emission and absorption properties are reviewed and several practical examples are given that illustrate the most important diagnostic features in the X-ray spectra. |
| Keywords: | Atomic processes Radiation mechanisms: thermal Intergalactic medium X-rays: general |
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