XTE J1817-330中的X射线照射和硬态截顶盘的内径
X-ray irradiation in XTE J1817-330 and the inner radius of the truncated disc in the hard state
摘要：
黑洞双星中低/硬X射线谱态的截断圆盘模型非常成功，其关键是几何薄圆盘在过渡到这种状态时从最后的稳定轨道后退。这最近受到了挑战的直接观察的低/硬状态光盘CCD数据。我们重新分析的斯威夫特和RXTE运动涵盖2006年爆发的XTE J1817-330，并表明，这些数据实际上强烈支持截断光盘模型的过渡光谱明确地表明，光盘开始后退的源离开光盘为主的软状态。适当的低/硬状态推断的光盘半径是不太明确的，但我们表明，从能量占主导地位的热等离子体的照射的影响导致低估了光盘半径的2-3倍，在这种状态下。这也可能产生一些硬态光谱中报告的软过量。当考虑到内边界处应力的电势差、辐射不完全热化引起的色温校正增加以及热等离子体中康普顿化引起的可观测圆盘光子的损失时，推断的半径变得更大。我们的结论是，在XTE J1817-330中的低/硬光谱状态的内盘半径是至少6-8倍，在光盘为主的高/软状态，和内盘的衰退是触发器的软-硬状态的过渡，如截断光盘模型预测。
英文摘要：
The key aspect of the very successful truncated disc model for the low/hard X-ray spectral state in black hole binaries is that the geometrically thin disc recedes back from the last stable orbit at the transition to this state. This has recently been challenged by direct observations of the low/hard state disc from CCD data. We reanalyze the Swift and RXTE campaign covering the 2006 outburst of XTE J1817-330 and show that these data actually strongly support the truncated disc model as the transition spectra unambiguously show that the disc begins to recede as the source leaves the disc dominated soft state. The disc radius inferred for the proper low/hard state is less clear-cut, but we show that the effect of irradiation from the energetically dominant hot plasma leads to an underestimate of the disc radius by a factor of 2-3 in this state. This may also produce the soft excess reported in some hard-state spectra. The inferred radius becomes still larger when the potential difference in stress at the inner boundary, increased colour temperature correction from incomplete thermalization of the irradiation, and loss of observable disc photons from Comptonization in the hot plasma are taken into account. We conclude that the inner disc radius in XTE J1817-330 in the low/hard spectral state is at least 6-8 times that seen in the disc dominated high/soft state, and that recession of the inner disc is the trigger for the soft--hard state transition, as predicted by the truncated disc models.
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