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It has been suggested that X-ray observations of rapidly variable Seyfertgalaxies may hold the key to probe the gas orbital motions in the innermostregions of accretion discs around black holes and, thus, trace flow patternsunder the effect of the hole strong gravitational field. We explore thispossibility analizing XMM-Newton observations of the seyfert 1 galaxy NGC 3783.A detiled time-resolved spectral analysis is performed down to the shortestpossible time-scales (few ks) using "excess maps" and cross-correlating lightcurves in different energy bands. In addition to a constant core of the Fe Kalpha line, we detected a variable and redshifted Fe K alpha emission featurebetween 5.3-6.1 keV. The line exhibits a modulation on a time-scale of 27 ksthat is similar to and in phase with a modulation of the 0.3-10 keV sourcecontinuum. The time-scale of the correlated variability of the redshifted Feline and continuum agrees with the local dynamical time-scale of the accretiondisc at 10 r_g around a black hole of 10^7 M_sun. Given the shape of theredshfted line emission and the overall X-ray variability pattern, the line islikely to arise from the relativistic region near the black hole.

Correlated modulation between the redshifted Fe K alpha line and the continuum emission in NGC 3783