Detection of distinct power spectra in soft and hard X-ray bands in the hard state of GRS 1915+105

Detection of distinct power spectra in soft and hard X-ray bands in the hard state of GRS 1915+105
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检测 GRS 硬状态下软和硬 X 射线波段的不同功率谱 1915 105

DOI:
10.1093/mnras/stu646
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发表时间:
2014-03
影响因子:
4.8
通讯作者:
Yu W.
Yu W.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Stiele H.;Yu W.

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著名的黑洞X射线双星GRS 1915+105是一个独特的来源,因为它不能被归类在黑洞双星状态的标准图片中。在这项工作中,我们研究档案XMM牛顿观测2003年和2004年之间的GRS 1915+105,这对应于硬态的标准黑洞X射线二元状态分类的chi变化类。我们研究的关键点是,通过使用XMM-牛顿数据,我们可以访问3 keV以下的可变性,这是RXTE未涵盖的能量范围。我们专注于软X射线和硬X射线波段的功率谱形状的研究,根据我们与Swift在MAXI J1659-152上所做的工作。在硬带(2.5千电子伏以上),功率密度谱包括带限噪声和准周期振荡,对应于在硬或中间状态看到的功率谱形状,而在软带的平均功率密度谱是一致的幂律噪声,对应于通常看到的功率谱形状在软状态。软频带和硬频带中两种不同的功率谱形状的共存,其中软频带功率谱由幂律噪声主导,与MAXI J1659-152一致,并且证实了功率谱状态的能量依赖性。我们额外的光谱分析表明,光盘组件有助于软带通量。这些研究结果支持观测到的黑洞功率谱状态取决于我们正在寻找的光谱分量,这意味着功率谱分析可能是一种比光谱建模更敏感的方法来跟踪硬或中间状态中的盘组件的出现。
The well-known black hole X-ray binary GRS 1915+105 is a unique source in the sense that it cannot be classified within the standard picture of black hole binary states. In this work, we study archival XMM-Newton observations taken between 2003 and 2004 of the chi variability class of GRS 1915+105, which corresponds to the hard state in the standard black hole X-ray binary state classification. The crucial point of our study is that by using XMM-Newton data, we can access the variability below 3 keV, an energy range that is not covered with RXTE. We focus on the study of the power spectral shape in the soft and hard X-ray band, in light of our work done with Swift on MAXI J1659-152. In the hard band (above 2.5 keV), power density spectra consist of band-limited noise and quasi-periodic oscillations, corresponding to the power spectral shape seen in the hard or intermediate state, while in the soft band the averaged power density spectrum is consistent with a power-law noise, corresponding to the power spectral shape usually seen in the soft state. The coexisting of two different power spectral shapes in the soft and hard band, where the soft-band power spectrum is dominated by a power-law noise, is consistent with MAXI J1659-152, and confirms the energy dependence of power spectral states. Our additional spectral analysis shows that the disc component does contribute to the soft-band flux. These findings support that the observed black hole power spectral state depends on which spectral component we are looking at, which implies that power spectral analysis is probably a more sensitive method than spectral modelling to trace the emergence of the disc component in the hard or intermediate state.
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