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arXiv 1702.04182astro-ph.HE
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吸积毫秒脉冲星MAXI J0911-655的随机X射线光变

The stochastic X-ray variability of the accreting millisecond pulsar MAXI J0911-655

Peter Bult

摘要:

在这项工作中,我报告的随机X射线可变性的340赫兹吸积毫秒脉冲星MAXI J 0911 -655。通过分析XMM-牛顿和NuSTAR天文台的定点观测,我发现该源在$0.01-10$ Hz范围内表现出宽带有限的随机变化,在$0.4-3$ keV能带中的总分数变化为$\sim24\%$ rms,在$3-10$ keV能带中增加到$\sim40\%$ rms。此外,还发现了一对谐波相关的准周期振荡。在$62$ mHz和$146$ mHz的频率之间观察到该谐波对的基频。像带限噪声一样,QPO的振幅作为能量的函数显示出急剧增加,这表明它们具有相似的起源,这可能是内部吸积流。基于它们的能量依赖性和它们与噪声项的频率关系,QPO被识别为低频振荡,并根据Lense-Thirring进动模型进行了讨论。

英文摘要:

In this work I report on the stochastic X-ray variability of the 340 Hz accreting millisecond pulsar MAXI J0911-655. Analyzing pointed observations of the XMM-Newton and NuSTAR observatories I find that the source shows broad band-limited stochastic variability in the $0.01-10$ Hz range, with a total fractional variability of $\sim24\%$ rms in the $0.4-3$ keV energy band, which increases to $\sim40\%$ rms in the $3-10$ keV band. Additionally a pair of harmonically related quasi-periodic oscillations are discovered. The fundamental frequency of this harmonic pair is observed between frequencies of $62$ mHz and $146$ mHz. Like the band-limited noise, the amplitude of the QPOs show a steep increase as a function of energy, suggesting they share a similar origin, which is likely the inner accretion flow. Based on their energy dependence and their frequency relation with respect to the noise terms, the QPOs are identified as Low-Frequency oscillations, and discussed in terms of Lense-Thirring precession model.

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