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On the Properties of Inner Cool Disks in the Hard State of Black Hole X-Ray Transient Systems

机译:黑洞X射线瞬态系统硬态内冷盘的性质。

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摘要

The continuum-fitting method is one of the two most advanced methods of determining the black hole spin in accreting X-ray binary systems. There are, however, still some unresolved issues with the underlying disk models. One of these issues manifests as an apparent decrease in spin for increasing source luminosity. Here, we perform a few simple tests to establish whether outflows from the disk close to the inner radius can address this problem. We employ four different parametric models to describe the wind and compare these to the apparent decrease in spin with luminosity measured in the sources LMC?X-3 and GRS?1915+105. Wind models in which parameters do not explicitly depend on the accretion rate cannot reproduce the spin measurements. Models with mass accretion rate dependent outflows, however, have spectra that emulate the observed ones. The assumption of a wind thus effectively removes the artifact of spin decrease. This solution is not unique; the same conclusion can be obtained using a truncated inner disk model. To distinguish among the valid models, we will need high-resolution X-ray data and a realistic description of the Comptonization in the wind.
机译:连续拟合法是确定吸积X射线二元系统中黑洞自旋的两种最先进的方法之一。但是,底层磁盘模型仍然存在一些未解决的问题。这些问题之一表现为自旋明显降低,从而增加了光源的发光度。在这里,我们执行一些简单的测试来确定磁盘从靠近内半径的流出是否可以解决此问题。我们采用四种不同的参数模型来描述风,并将它们与在LMC?X-3和GRS?1915 + 105光源中测得的自旋随光度的明显下降进行比较。参数不显式取决于吸积率的风模型无法重现自旋测量值。但是,具有依赖质量增长速率的流出的模型具有可模拟观察到的光谱的光谱。风的假设因此有效地消除了自旋下降的伪影。这个解决方案不是唯一的;使用截短的内部磁盘模型可以得到相同的结论。为了区分有效的模型,我们将需要高分辨率的X射线数据和风中Comptonization的真实描述。

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