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The NuSTAR view of a QPO Evolution of GRS 1915+105

Zhang, Liang and Chen, Li and Qu, Jin-lu and Bu, Qing-cui (2015) The NuSTAR view of a QPO Evolution of GRS 1915+105. Astronomical Journal, 149 (2). pp. 82-88. ISSN 0004-6256. doi:10.1088/0004-6256/149/2/82.

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We report a timing analysis of the black hole binary GRS 1915+105 with the Nuclear Spectroscopic Telescope Array Observatory. A strong type-C quasi-periodic oscillation (QPO) below 2 Hz appears in the power density spectrum during the whole observation, whose frequency is correlated with the 3–25 keV count rate. The QPO shows a sudden increase in frequency along with an increase in flux and a softening of the spectrum. We discuss the possible origin of the QPO and the reasons that lead to the QPO frequency variation. It is suggested that the reflection component has little influence on QPO frequency and the increase in QPO frequency could be associated with the inward motion of the outer part of the disk.

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Zhang, Liang0000-0003-3115-1752
Additional Information:© 2015. The American Astronomical Society. Received 2014 October 16, accepted for publication 2014 December 26. Published 2015 January 30. We thank H. Q. Gao and Z. Zhang for theory suggestions. This research has made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NuSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). This work is supported by the National Basic Research program of China 973 Program 2009CB824800, the National Natural Science Foundation of China (11173024), and the Fundamental Research Funds for the Central Universities, the Strategic Priority Research Program on Space Science, the Chinese Academy of Sciences, Grant No. XDA04010300.
Funding AgencyGrant Number
National Basic Research Program of China, Program 9732009CB824800
Natural Science Foundation China11173024
Chinese Academy of SciencesXDA04010300
Issue or Number:2
Record Number:CaltechAUTHORS:20150824-183949369
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59867
Deposited By: Joy Painter
Deposited On:25 Aug 2015 15:14
Last Modified:10 Nov 2021 22:26

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