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Several X-ray observations have recently revealed the presence ofreverberation time delays between spectral components in AGN. Most of theobserved lags are between the power-law Comptonization component, seendirectly, and the soft excess produced by reflection in the vicinity of theblack hole. NGC 4151 was the first object to show these lags in the iron Kband. Here, we report the discovery of reverberation lags in the Fe K band intwo other sources: MCG-5-23-16 and NGC 7314. In both objects, the 6-7 keV band,where the Fe K line peaks, lags the bands at lower and higher energies with atime delay of ~ 1 kilo-seconds. These lags are unlikely to be due to the narrowFe K line. They are fully consistent with reverberation of therelativistically-broadened iron K line. The measured lags, their time-scale andspectral modeling, indicate that most of the radiation is emitted at ~ 5 and 24gravitational radii for MCG-5-23-16 and NGC 7314 respectively.

Discovery of Fe K-alpha X-ray reverberation around the black holes in MCG-5-23-16 and NGC 7314