@inproceedings{8ad6fcafba424a669893f4f15aa4a2d5,
title = "Anomalous diffusion in the dynamics of X-ray emission of astrophysical objects",
abstract = "We use the anomalous-diffusion interpolation and parameterization procedure developed within the framework of flicker-noise spectroscopy (FNS) to characterize the stochastic variability of X-ray emission from accreting black hole GRS 1915+105. Our analysis of the lightcurves with a sampling frequency of 16 Hz in soft and hard X-ray energy bands shows that the stochastic variability of soft-band lightcurves is mostly subdiffusive while the hard X-ray emission is characterized primarily by fractional Gaussian noise. The comparison of FNS parameters between the soft and hard energy bands (corresponding roughly to different X-ray emission mechanisms) implies that hard X-rays have more relative variability at higher frequencies and are characterized by shorter diffusion timescales than soft X-rays. We suggest that the differences in the stochastic variabilities may be attributed to changes in either the viscosity law in the accretion disk or the geometry of the accretion flow.",
keywords = "GRS 1915+105, anomalous diffusion, astrophysics, flicker-noise spectroscopy",
author = "Polyakov, {Yuriy S.} and Joseph Neilsen and Timashev, {Serge F.}",
year = "2011",
doi = "10.1109/ICNF.2011.5994277",
language = "English (US)",
isbn = "9781457701924",
series = "Proceedings of the IEEE 21st International Conference on Noise and Fluctuations, ICNF 2011",
pages = "115--118",
booktitle = "Proceedings of the IEEE 21st International Conference on Noise and Fluctuations, ICNF 2011",
note = "21st International Conference on Noise and Fluctuations, ICNF 2011 ; Conference date: 12-06-2011 Through 16-06-2011",
}