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X-ray spectroscopy of active galaxies
The X-ray reflection features of irradiated accretion disks around black holes enable us to probe the effects of strong gravity and learn the black-hole properties. We investigate the reflection signs, i.e. the iron K-line and the Comptonized hump, which arise by reprocessing of radiation on the surface of an accretion disc, and how they are affected by the spin of a rotating black hole.