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Characterising anomalous transport in accretion disks from X-ray observations

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Greenhough, J., Chapman, Sandra C., Chaty, S., Dendy, R. O. and Rowlands, G. (George). (2002) Characterising anomalous transport in accretion disks from X-ray observations. Astronomy & Astrophysics, Vol.385 (No.2). pp. 693-700. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361:20020013

Abstract

Whilst direct observations of internal transport in accretion disks are not yet possible, measurement of the energy emitted from accreting astrophysical systems can provide useful information on the physical mechanisms at work. Here we examine the unbroken multi-year time variation of the total X-ray flux from three sources: Cygnus X-1 , the microquasar GRS 1915+105 , and for comparison the nonaccreting Crab nebula. To complement previous analyses, we demonstrate that the application of advanced statistical methods to these observational time-series reveals important contrasts in the nature and scaling properties of the transport processes operating within these sources. We find the Crab signal resembles Gaussian noise; the Cygnus X-1 signal is a leptokurtic random walk whose self-similar properties persist on timescales up to three years; and the GRS 1915+105 signal is similar to that from Cygnus X-1, but with self-similarity extending possibly to only a few days. This evidence of self-similarity provides a robust quantitative characterisation of anomalous transport occuring within the systems.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Accretion (Astrophysics), X-ray sources, Galactic -- Accretion
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Date:	April 2002
Volume:	Vol.385
Number:	No.2
Page Range:	pp. 693-700
Identification Number:	10.1051/0004-6361:20020013
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Leverhulme Trust (LT), Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Great Britain. Dept. of Trade and Industry (DTI), Euratom
Grant number:	F/00-180/A (Leverhulme)
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URI:	http://wrap.warwick.ac.uk/id/eprint/3816