BeppoSAX confirms extreme relativistic effects in the X-ray spectrum of MCG-6-30-15

We report in this Letter the first simultaneous measure of the X-ray broadb and (0.1-200 keV) continuum and of the iron K alpha fluorescent line profil e in the Seyfert 1 galaxy MCG-6-30-15. Our data confirms the ASCA detection of a skewed and redshifted line profile (Tanaka et al. 1995). The most str aightforward explanation is that the line photons are emitted in the innerm ost regions of a X-ray illuminated relativistic disk. The line Equivalent W idth (similar or equal to 200 eV) is perfectly consistent with the expected value for solar abundances, given the observed amount of Compton reflectio n. We report also the discovery of a cut-off in the nuclear primary emissio n at the energy of similar or equal to 160 keV.