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We present the results from the Fourier Resolved Spectroscopy of archivalXMM-Newton data of five AGN, namely, Mrk 766, NGC 3516, NGC 3783, NGC 4051 andArk 564. This work supplements the earlier study of MCG-6-30-15 as well asthose of several Galactic Black Hole Candidate sources. Our results exhibitmuch larger diversity than those of Galactic sources, a fact we attribute tothe diversity of their masses. When we take into account this effect andcombine our results with those from Cyg X-1, it seems reasonable to concludethat, at high frequencies, the slope of the Fourier-resolved spectra inaccreting black hole systems decreases with increasing frequency asproportional to f^{-0.25}, irrespective of whether the system is in its High orLow state. This result implies that the flux variations in AGN are accompaniedby complex spectral slope variations as well. We also find that the Fe Ka linein Mrk 766, NGC 3783 and NGC 4051 is variable on time scales ~day - 1 hour. Theiron fluorescence line is absent in the spectra of the highest frequencies,andthere is an indication that, just like in Cyg X-1, the equivalent width of theline in the Fourier-resolved of AGN decreases with increasing frequency.Comment: 45 pages, 10 figures. Accepted for publication in Ap

Fourier‐Resolved Spectroscopy of Active Galactic Nuclei UsingXMM‐NewtonData. I. The 3–10 keV Band Results