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Observations of quasi-periodic oscillations (QPOs) in X-ray binaries hold akey to understanding many aspects of these enigmatic systems. Complexappearance of the Fourier phase lags related to QPOs is one of the mostpuzzling observational effects in accreting black holes. In this Letter we showthat QPO properties, including phase lags, can be explained in a framework of asimple scenario, where the oscillating media provides a feedback on theemerging spectrum. We demonstrate that the QPO waveform is presented by theproduct of a perturbation and a time delayed response factors, where theresponse is energy dependent. The essential property of this effect is itsnon-linear and multiplicative nature. Our multiplicative reverberation modelsuccessfully describes the QPO components in energy dependent power spectra aswell as the appearance of the phase lags between signal in different energybands. We apply our model to QPOs observed by Rossi X-ray Timing Explorer in BHcandidate XTE J1550-564. We briefly discuss the implications of the observedenergy dependence of the QPO reverberation times and amplitudes to the natureof the power law spectral component and its variability.

On the nature of QPO phase lags in black hole candidates