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Identification of a 12-17 day timescale in X-ray observations of GRS 1915+105

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Greenhough, J., Chapman , Sandra C., Chaty, S., Dendy, R. O. and Rowlands , G. (George) (2003) Identification of a 12-17 day timescale in X-ray observations of GRS 1915+105. Monthly Notices of the Royal Astronomical Society, Vol.340 (No.3). pp. 851-855. doi:10.1046/j.1365-8711.2003.06340.x

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Official URL: http://dx.doi.org/10.1046/j.1365-8711.2003.06340.x

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Abstract

Measurement of the energy emitted from accreting astrophysical systems provides an observational constraint on the plasma processes that may be operating within the disk. Here we examine the continual time variation over the past six years of the total X-ray flux from the microquasar GRS 1915+105. The application of differencing and rescaling techniques to RXTE/ASM data shows that the small amplitude fluctuations scale up to 12-17 days. A 17-day timescale in the X-ray fluctuations corresponds to half the measured binary orbital period of this system (33.5 +/- 1.5 days). While this may be coincidental, it is possible that these two timescales may be linked by, for example, a turbulent cascade in the accretion disk driven by a tidally-induced two-armed spiral shock corotating with the binary system. Temporal scaling is found only in the ever-present small fluctuations, and not in the intermittent larger-amplitude fluctuations. This is consistent with the basic model for this source which consists of a steady, cold outer disk and an unstable inner disk.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Accretion (Astrophysics), X-ray binaries, X-ray astronomy, Statistical astronomy, Black holes (Astronomy), Astronomy -- Observations
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Official Date: 2003
Dates:
DateEvent
2003Published
Volume: Vol.340
Number: No.3
Page Range: pp. 851-855
DOI: 10.1046/j.1365-8711.2003.06340.x
Status: Peer Reviewed
Access rights to Published version: Restricted or Subscription Access
Funder: Leverhulme Trust (LT)
Grant number: F/00–180/A (LT)

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