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• W2000282712 abstract "Context. We study some general properties of accretion disc variability in the context of stationary random processes. In partic ular, we are interested in mathematical constraints that can be imposed on the functional form of the Fourier power-spectrum density (PSD) that exhibits a multiply broken shape and several local maxima. Aims. We develop a methodology for determining the regions of the model parameter space that can in principle reproduce a PSD shape with a given number and position of local peaks and breaks of the PSD slope. Given the vast space of possible parameters, it is an important requirement that the method is fast in estimating the PSD shape for a given parameter set of the model. Methods. We generated and discuss the theoretical PSD profiles of a sho t-noise-type random process with exponentially decaying fl ares. Then we determined conditions under which one, two, or more breaks or local maxima occur in the PSD. We calculated positions of these features and determined the changing slope of the model PSD. Furthermore, we considered the influence of the modulation by the orbi tal motion for a variability pattern assumed to result from an orbiting-spo t model. Results. We suggest that our general methodology can be useful in for describing non-monotonic PSD profiles (such as the trend seen , on different scales, in exemplary cases of the high-mass X-ray binary Cygnus X-1 and the narrow-line Seyfert galaxy Ark 564). We adopt a model where these power spectra are reproduced as a superposition of several Lorentzians with varying amplitudes in the X-ray-band light curve. Our general approach can help in constraining the model parameters and in determining which parts of the parameter space are accessible under various circumstances." @default.
• W2000282712 created "2016-06-24" @default.
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• W2000282712 date "2013-08-01" @default.
• W2000282712 modified "2023-10-16" @default.
• W2000282712 title "Hot-spot model for accretion disc variability as random process - II. Mathematics of the power-spectrum break frequency" @default.
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• W2000282712 hasPublicationYear "2013" @default.
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