Anomalous diffusion in the dynamics of X-ray emission of astrophysical objects

Yuriy S. Polyakov, Joseph Neilsen, Serge F. Timashev

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationProceedings of the IEEE 21st International Conference on Noise and Fluctuations, ICNF 2011
Pages115-118
Number of pages4
DOIs
StatePublished - Sep 19 2011
Externally publishedYes
Event21st International Conference on Noise and Fluctuations, ICNF 2011 - Toronto, ON, Canada
Duration: Jun 12 2011Jun 16 2011

Publication series

NameProceedings of the IEEE 21st International Conference on Noise and Fluctuations, ICNF 2011

Other

Other21st International Conference on Noise and Fluctuations, ICNF 2011
CountryCanada
CityToronto, ON
Period6/12/116/16/11

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Mechanical Engineering

Keywords

  • GRS 1915+105
  • anomalous diffusion
  • astrophysics
  • flicker-noise spectroscopy

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