Spectra and variability patterns of Seyferts

A. Zdziarski

The spectra and variability of Seyferts are consistent with predominantly thermal Comptonization in a hot plasma with kT of about 100 keV, and reprocessing of the Comptonized radiation both close to the central black hole and in a remote medium. The reprocessing region supplies also seed photons for Compton upscattering. Correlations between various spectral components (the X-ray power law, Compton reflection, Fe K alpha line) constrain the geometry, e.g., ruling out a static corona above a cold disk.