A chapter wrote by M. Barbera, U. Lo Cicero and L. Sciortino (INAF-OAPA) on the filters for X-ray telescopes is included in the: “Handbook of X-ray and gamma ray astrophysics”
X-ray astronomy explores the high-energy Universe. X-rays are, in fact, high energy photons emitted by very hot gas (with temperature of some milion degrees) or by processes involving relativistic particles. Some astronomical sources of X-rays radiation are: accreting black holes, such as the supermassive black holes at the center of active galaxies, stellar coronae, supernova remnants, and clusters of galaxies.
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