Correlated X-Ray Spectral and Timing Behavior of the Black Hole Candidate XTE J1550–564: A New Interpretation of Black Hole States
Correlated X-Ray Spectral and Timing Behavior of the Black Hole Candidate XTE J1550–564: A New Interpretation of Black Hole States
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DOI：
10.1086/318954
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发表时间：
2000-01
期刊：
影响因子：
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通讯作者：
J. Homan;R. Wijnands;M. van der Klis;T. Belloni;J. van Paradijs;M. Klein-Wolt;R. Fender;M. Méndez-M.-Mén
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文献类型：
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作者：
J. Homan;R. Wijnands;M. van der Klis;T. Belloni;J. van Paradijs;M. Klein-Wolt;R. Fender;M. Méndez-M.-Mén
我们提出了一个黑洞候选人和X射线瞬态XTE J1550-564的数据分析，采取与罗西X射线定时探测器1998年11月22日和1999年5月20日之间。在此期间，源经历了几种不同的状态，根据高能光谱分量的相对强度，这些状态可以分为软态和硬态。这些状态在颜色-颜色图和硬度-强度图中表现为不同的分支，连接形成梳状拓扑结构，对应于软态的分支形成梳脊，对应于各种硬态的分支形成梳齿。源的功率谱特性与其在分支上的位置密切相关。随着频谱变硬，宽带噪声变得更强，并从幂律类变为带限。在硬支和软分支上及附近出现3种准周期振荡（QPO）：1-18 Hz和102-284 Hz QPO。硬枝上1-18 Hz的QPO可分为三种亚型。硬枝上的高、低频QPO频率相互相关，与光谱硬度呈负相关。在QPO频率的变化表明，内盘半径仅增加了3-4倍，从软到硬状态的源的变化。我们对XTE J1550-564的研究结果强烈支持对黑洞行为的二维描述，其中在色-色图中梳脊附近的区域可以被识别为高态，并且齿从高态过渡到中间态（包括非常高的状态）到低态，然后返回。这种二维行为背后的两个物理参数在很大程度上是独立变化的，例如可以是通过盘的吸积速率和导致硬尾的康普顿化区域的大小。不同的牙齿之间的差异，然后与通过磁盘的质量吸积率，表明高状态Particlow状态转换可以发生在任何磁盘质量吸积率，这些转换主要是由另一个，独立的参数。我们将讨论这幅图如何与通常观察到的黑洞候选者的典型一维行为联系起来。
We present an analysis of data of the black hole candidate and X-ray transient XTE J1550-564, taken with the Rossi X-Ray Timing Explorer between 1998 November 22 and 1999 May 20. During this period the source went through several different states, which could be divided into soft and hard states based on the relative strength of the high-energy spectral component. These states showed up as distinct branches in the color-color and hardness-intensity diagrams, connecting to form a structure with a comblike topology, the branch corresponding to the soft state forming the spine and the branches corresponding to the various hard states forming the teeth of the comb. The power spectral properties of the source were strongly correlated with its position on the branches. The broadband noise became stronger and changed from power law-like to band-limited, as the spectrum became harder. Three types of quasi-periodic oscillations (QPOs) were found: 1-18 Hz and 102-284 Hz QPOs on the hard branches, and 16-18 Hz QPOs on and near the soft branch. The 1-18 Hz QPOs on the hard branches could be divided into three subtypes. The frequencies of the high- and low-frequency QPOs on the hard branches were correlated with each other and were anticorrelated with spectral hardness. The changes in QPO frequency suggest that the inner disk radius only increases by a factor of 3-4 as the source changes from a soft to a hard state. Our results on XTE J1550-564 strongly favor a two-dimensional description of black hole behavior, where the regions near the spine of the comb in the color-color diagram can be identified with the high state, and the teeth with transitions from the high state, via the intermediate state (which includes the very high state) to the low state, and back. The two physical parameters underlying this two-dimensional behavior vary to a large extent independently and could for example be the accretion rate through the disk and the size of the Comptonizing region causing the hard tail. The difference between the various teeth is then associated with the mass accretion rate through the disk, suggesting that high state ↔ low state transitions can occur at any disk mass accretion rate and that these transitions are primarily caused by another, independent parameter. We discuss how this picture could tie in with the canonical, one-dimensional behavior of black hole candidates that has usually been observed.