THE ENERGY DEPENDENCE OF THE CENTROID FREQUENCY AND PHASE LAG OF THE QUASI-PERIODIC OSCILLATIONS IN GRS 1915+105
THE ENERGY DEPENDENCE OF THE CENTROID FREQUENCY AND PHASE LAG OF THE QUASI-PERIODIC OSCILLATIONS IN GRS 1915+105
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DOI：
10.1088/0004-637x/710/1/836
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发表时间：
2009-12
期刊：
影响因子：
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通讯作者：
Jing Qu;F. Lu;Yuzhang Lu;L. Song;S. Zhang;Guo-Qiang Ding;Jingying Wang
中科院分区：
文献类型：
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作者：
Jing Qu;F. Lu;Yuzhang Lu;L. Song;S. Zhang;Guo-Qiang Ding;Jingying Wang
本文研究了GRS 1915+105的准周期振荡（QPO）的质心频率和相位滞后随光子能量的变化。发现0.5-10 Hz准等离子体振荡的中心频率和相位滞后都与能量有关，且频率和相位滞后之间存在着线性关系。这些新的结果挑战了流行的QPO模型，因为它们都不能完全解释所观察到的性质。我们认为，所观察到的QPO相位滞后部分是由于QPO频率随能量的变化，特别是对于那些频率高于3.5 Hz。
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.