An additional soft X-ray component in the dim low/hard state of black hole binaries
An additional soft X-ray component in the dim low/hard state of black hole binaries
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黑洞双星昏暗低/硬态中的附加软 X 射线分量
DOI：
10.1111/j.1365-2966.2009.16129.x
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发表时间：
2010
影响因子：
4.8
通讯作者：
Chiang C
中科院分区：
文献类型：
--
作者：
Chiang C
我们使用来自2005年黑洞eswiftj1753.5−0127硬态爆发的多波长（光学/紫外/ x射线）数据来测试截断盘模型。这个系统既相当明亮，又有相当低的星际吸收，因此提供了研究这种状态下微弱的冷盘发射的最佳数据集之一。我们使用x射线照射圆盘模型拟合这些数据，以约束整个爆发过程中圆盘内部的半径。在接近峰值时，观测到的软x射线成分与内盘产生的成分一致，在盘和日冕之间的重叠区域，通过对硬x射线照明的再处理，其本征发射的温度和光度有所增强。这种盘状发射为康普顿散射提供种子光子，产生硬x射线光谱，这些硬x射线也照亮外盘，通过再处理产生光学发射。然而，随着爆发的减少，情况就大不相同了。光学的可能是循环同步辐射，由流自己产生，而不是跟踪外部圆盘。同样，由于再处理的限制，软x射线不太可能直接追踪到盘的内部半径。相反，它们似乎来自一个新的组件。这在来自XTE J1118+480的类似暗淡的低/硬状态光谱中可以看到得更清楚，其中星际吸收低10倍，相应地可以更好地观察紫外线/极紫外线（EUV）发射。相对高温的软x射线成分所暗示的很小的发射面积与更大、更冷的紫外线成分完全不一致，后者被截断的圆盘很好地拟合。我们推测了这个分量的来源，但它作为一个明显独立于XTE J1118+480中截断盘的光谱分量的存在表明，它并不是简单地追踪内部盘的半径，因此不能约束截断盘的模型。
We test the truncated disc models using multiwavelength (optical/ultraviolet/X-ray) data from the 2005 hard state outburst of the black holeSwiftJ1753.5−0127. This system is both fairly bright and has fairly low interstellar absorption, so gives one of the best data sets to study the weak, cool disc emission in this state. We fit these data using models of an X-ray illuminated disc to constrain the inner disc radius throughout the outburst. Close to the peak, the observed soft X-ray component is consistent with being produced by the inner disc, with its intrinsic emission enhanced in temperature and luminosity by reprocessing of hard X-ray illumination in an overlap region between the disc and corona. This disc emission provides the seed photons for Compton scattering to produce the hard X-ray spectrum, and these hard X-rays also illuminate the outer disc, producing the optical emission by reprocessing.However, the situation is very different as the outburst declines. The optical is probably cyclo-synchrotron radiation, self-generated by the flow, rather than tracing the outer disc. Similarly, limits from reprocessing make it unlikely that the soft X-rays are directly tracing the inner disc radius. Instead they appear to be from a new component. This is seen more clearly in a similarly dim low/hard state spectrum from XTE J1118+480, where the 10 times lower interstellar absorption allows a correspondingly better view of the ultraviolet/extreme ultraviolet (EUV) emission. The very small emitting area implied by the relatively high temperature soft X-ray component is completely inconsistent with the much larger, cooler, ultraviolet component which is well fit by a truncated disc. We speculate on the origin of this component, but its existence as a clearly separate spectral component from the truncated disc in XTE J1118+480 shows that it does not simply trace the inner disc radius, so cannot constrain the truncated disc models.
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DOI：
10.1086/323258
发表时间：
2001-07
期刊：
The Astrophysical Journal
影响因子：
--
作者：
F. Frontera;A. Zdziarski;L. Amati;J. Mikołajewska;T. Belloni;S. del Sordo;F. Haardt;E. Kuulkers;N. Masetti;M. Orlandini;E. Palazzi;A. Parmar;R. Remillard;A. Santangelo;L. Stella
通讯作者：
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DOI：
10.1111/j.1365-2966.2004.08134.x
发表时间：
2003-12
影响因子：
4.8
作者：
A. Kubota;Chris Done Riken;U. Durham
通讯作者：
A. Kubota;Chris Done Riken;U. Durham
DOI：
10.1046/j.1365-8711.1998.01295.x
发表时间：
1988
影响因子：
4.8
作者：
A. King;H. Ritter
通讯作者：
A. King;H. Ritter
对 GX 339-4 两种状态行为的红外、光学和 X 射线研究
DOI：
--
发表时间：
1985
期刊：
影响因子：
--
作者：
C. Motch;S. Ilovaisky;C. Chevalier;P. Angebault
通讯作者：
P. Angebault
DOI：
10.1086/590906
发表时间：
2008-06
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
M. Durant;P. Gandhi;T. Shahbaz;A. Fabian;Jonathan M. Miller;V. Dhillon;T. Marsh
通讯作者：
M. Durant;P. Gandhi;T. Shahbaz;A. Fabian;Jonathan M. Miller;V. Dhillon;T. Marsh