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Relativistic spectral features from X-ray-illuminated spots and the measure of the black hole mass in active galactic nuclei
Narrow spectral features in the 5--6 keV range were recently discovered in the X-ray spectra of a few active galactic nuclei. We discuss the possibility that these features are due to localized spots which occur on the surface of an accretion disc following its illumination by flares. We present detailed …