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arXiv 2209.05930astro-ph.HE
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基于Insight-HXMT的天鹅座X-1谱定时分析

The spectral-timing analysis of Cygnus X-1 with Insight-HXMT

M. Zhou, V. Grinberg, Q. -C. Bu, A. Santangelo, F. Cangemi, C. M. Diez, O. König, L. Ji, M. A. Nowak, K. Pottschmidt, J. Rodriguez, J. Wilms, S. Zhang, J. -L. Qu, S. -N. Zhang

摘要:

天鹅座X-1作为第一个发现的黑洞双星,是理解极端重力场中状态转换机制和吸积现象的关键来源。我们提出了一个频谱定时分析的观察与洞察HXMT任务,专注于光谱状态依赖的定时属性在广泛的能量范围内的1- 150 keV,从而扩展以前的RXTE为基础的研究,以更低和更高的能量。我们的主要结果是:a)我们成功地用一个简单的经验模型拟合了所有的谱,证实了软态的反射分量比硬态强:b)总分数均方根(rms)的演化依赖于所选的能带和谱形状,这是功率谱密度(PSD)演化的直接结果; c)在硬/中间态中,我们看到明显的短期可变性特征以及可变性分量的中心频率与软光子指数$Γ_1$之间的正相关性,也是在15 keV以上的能量处。在软态下,功率谱主要由红噪声控制。这些行为可以追溯到至少90 keV; d)相干性和相位滞后谱显示出取决于不同谱形状的不同行为。

英文摘要:

Cygnus X-1, as the first discovered black hole binary, is a key source for understanding the mechanisms of state transitions, and the scenarios of accretion in extreme gravity fields. We present a spectral-timing analysis of observations taken with the Insight-HXMT mission, focusing on the spectral-state dependent timing properties in the broad energy range of 1--150 keV, thus extending previous RXTE-based studies to both lower and higher energies. Our main results are the following: a) We successfully use a simple empirical model to fit all spectra, confirming that the reflection component is stronger in the soft state than in the hard state; b) The evolution of the total fractional root mean square (rms) depends on the selected energy band and the spectral shape, which is a direct result of the evolution of the power spectral densities (PSDs); c) In the hard/intermediate state, we see clear short-term variability features and a positive correlation between central frequencies of the variability components and the soft photon index $Γ_1$, also at energies above 15 keV. The power spectrum is dominated by red noise in the soft state instead. These behaviors can be traced to at least 90 keV; d) The coherence and the phase-lag spectra show different behaviors dependent on different spectral shapes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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