期刊
ASTROPHYSICAL JOURNAL
卷 710, 期 1, 页码 836-842出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/710/1/836
关键词
accretion, accretion disks; black hole physics; stars: individual (GRS 1915+105); stars: oscillations
资金
- National Basic Research Program of China [2009CB824800]
- Natural Science Foundation of China [10773017]
- Natural Science Foundation of Xinjiang Uygur Autonomous Region of China [200821164]
- Program of the Light in Chinese Western Region [LHXZ 200802]
We present a study of the centroid frequencies and phase lags of quasi-periodic oscillations (QPOs) as functions of photon energy for GRS 1915+105. It is found that the centroid frequencies of the 0.5-10 Hz QPOs and their phase lags are both energy dependent, and there exists an anticorrelation between the QPO frequency and phase lag. These new results challenge the popular QPO models, because none of them can fully explain the observed properties. We suggest that the observed QPO phase lags are partially due to the variation of the QPO frequency with energy, especially for those with frequency higher than 3.5 Hz.
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