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Relation between the quasi-periodic oscillations and the low-frequency noise of GX 5-1 in the horizontal branchGinga observations of quasi-periodic oscillations (QPOs) and the low-frequency noise (LFN) from GX 5-1 in its horizontal-branch spectral state are presented. Power spectral fits were attempted using model functions based on simple oscillating shot models. A clear second-harmonic peak of QPO was detected. Variations in the powers of QPO and LFN on timescales of 8-256 s were also studied. These variations were significant for all of the timescales studied, and were uncorrelated with each other on timescales shorter than a few tens of seconds, and correlated on longer timescales. From simulations based on a simple shot model, it was found that the variation amplitude and the lack of correlation on short timescales are not inconsistent with the oscillating shot models. A more complex model is necessary to fully explain the observed properties.
Document ID
19910053084
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mitsuda, Kazuhisa
(Tokyo Univ. Sagamihara, Japan)
Dotani, Tadayasu
(Tokyo Univ. Sagamihara, Japan)
Yoshida, Atsumasa
(Institute of Space and Astronautical Science Sagamihara, Japan)
Vaughan, Brian
(Stanford University CA, United States)
Norris, Jay P.
(NASA Goddard Space Flight Center Greenbelt, MD; U.S. Navy, Naval Research Laboratory, Washington, DC, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Astronomical Society of Japan, Publications
Volume: 43
Issue: 1, 19
ISSN: 0004-6264
Subject Category
Astrophysics
Accession Number
91A37707
Distribution Limits
Public
Copyright
Other

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