
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.
37 pages, 16 figures, accepted for publication in Space Science Reviews, special issue "Clusters of galaxies: beyond the thermal view", Editor J.S. Kaastra, Chapter 9; work done by an international team at the International Space Science Institute (ISSI), Bern, organised by J.S. Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker
ddc:600, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Atomic processes, X-rays: general, Astrophysics, Radiation mechanisms: thermal, [SDU] Sciences of the Universe [physics], Space and Planetary Science, Mathematisch-Naturwissenschaftliche Fakultät, Intergalactic medium
ddc:600, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Atomic processes, X-rays: general, Astrophysics, Radiation mechanisms: thermal, [SDU] Sciences of the Universe [physics], Space and Planetary Science, Mathematisch-Naturwissenschaftliche Fakultät, Intergalactic medium
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