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题名: A timing view of the heartbeat state of GRS 1915+105
作者: Yan, Shu-Ping; Ji, Li; Mendez, Mariano; Liu, Si-Ming; Wang, Na; Li, Xiang-Dong; Ge, Ming-Yu; Liao, Jin-Yuan; Niu, Shu; Qu, Jin-Lu; Ding, Guo-Qiang; Liu, Qing-Zhong; Sun, Wei
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2017
卷号: 465, 期号:2, 页码:1926-1933
英文摘要: We present a timing analysis of two Rossi X-ray Timing Explorer observations of the micro-quasar GRS 1915+ 105 during the heartbeat state. The phase-frequency-power maps show that the intermediate-frequency aperiodic X-ray variability weakens as the source softens in the slow rise phase, and when the quasi-periodic oscillation disappears in the rise phase of the pulse of the double-peaked class, its sub-harmonic is still present with a hard phase lag. In the slow rise phase, the energy-frequency-power maps show that most of the aperiodic variability is produced in the corona, and may also induce the aperiodic variability observed at low energies from an accretion disc, which is further supported by the soft phase lag especially in the intermediate-frequency range (with a time delay up to 20 ms). In the rise phase of the pulse, the low-frequency aperiodic variability is enhanced significantly and there is a prominent hard lag (with a time delay up to 50 ms), indicating that the variability is induced by extension of the disc towards small radii as implied by the increase in flux and propagates into the corona. However, during the hard pulse of the double-peaked class, the variability shows no significant lag, which may be attributed to an optically thick corona. These timing results are generally consistent with the spectral results presented by Neilsen, Remillard & Lee which indicated that the slow rise phase corresponds to a local Eddington limit and the rise phase of the pulse corresponds to a radiation pressure instability in the disc.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17323
Appears in Collections:暗物质和空间天文实验室_期刊论文

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