STOCHASTIC VARIABILITY IN X-RAY EMISSION FROM THE BLACK HOLE BINARY GRS 1915+105
Name
Polyakov-2012-STOCHASTIC VARIABILI.pdf
Size
582.73 KB
Format
Adobe PDF
Checksum (MD5)
3d1341b6b8a0c289b8a164e682da5a2a
Author(s)
Polyakov, Yuriy S.
Timashev, Serge F.
Neilsen, Joseph M. G.
Date Issued
May 2012
Journal
The Astronomical Journal
Publisher
IOP Publishing
Citation
Polyakov, Yuriy S., Joseph Neilsen, and Serge F. Timashev. “STOCHASTIC VARIABILITY IN X-RAY EMISSION FROM THE BLACK HOLE BINARY GRS 1915+105.” The Astronomical Journal 143, no. 6 (May 14, 2012): 148. © 2012 The American Astronomical Society
Version
Final published version
Abstract
We examine stochastic variability in the dynamics of X-ray emission from the black hole system GRS 1915+105, a strongly variable microquasar commonly used for studying relativistic jets and the physics of black hole accretion. The analysis of sample observations for 13 different states in both soft (low) and hard (high) energy bands is performed by flicker-noise spectroscopy (FNS), a phenomenological time series analysis method operating on structure functions and power spectrum estimates. We find the values of FNS parameters, including the Hurst exponent, flicker-noise parameter, and characteristic timescales, for each observation based on multiple 2500 s continuous data segments. We identify four modes of stochastic variability driven by dissipative processes that may be related to viscosity fluctuations in the accretion disk around the black hole: random (RN), power-law (1F), one-scale (1S), and two-scale (2S). The variability modes are generally the same in soft and hard energy bands of the same observation. We discuss the potential for future FNS studies of accreting black holes.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/0004-6256/143/6/148
