用X射线连续拟合方法测量黑洞的自旋：超越热主导态
Measuring Black Hole Spin via the X-ray Continuum Fitting Method: Beyond the Thermal Dominant State
摘要：
所有先前通过X射线连续拟合方法测量恒星质量黑洞自旋的工作都依赖于使用在热主导态下获得的弱康普顿化光谱。使用自洽康普顿化模型，我们表明，可以分析光谱，表现出强大的幂律分量，并获得的值的内部磁盘半径，因此自旋，这是一致的热主导状态中获得的。具体地说，我们分析了两个黑洞瞬变，H 1743 -322和XTE J 1550 -564的许多RXTE光谱，我们证明，吸积盘的内边缘的半径保持恒定，在百分之几的康普顿化分量的强度增加一个数量级，即，因为被散射的热种子光子的分数接近25%。我们得出结论，连续拟合方法可以应用于比以前认为可能的更广泛的数据体，以及从未观察到进入热主导状态的源（例如，Cyg X-1）。
英文摘要：
All prior work on measuring the spins of stellar-mass black holes via the X-ray continuum-fitting method has relied on the use of weakly-Comptonized spectra obtained in the thermal dominant state. Using a self-consistent Comptonization model, we show that one can analyze spectra that exhibit strong power-law components and obtain values of the inner disk radius, and hence spin, that are consistent with those obtained in the thermal dominant state. Specifically, we analyze many RXTE spectra of two black hole transients, H1743-322 and XTE J1550-564, and we demonstrate that the radius of the inner edge of the accretion disk remains constant to within a few percent as the strength of the Comptonized component increases by an order of magnitude, i.e., as the fraction of the thermal seed photons that are scattered approaches 25%. We conclude that the continuum-fitting method can be applied to a much wider body of data than previously thought possible, and to sources that have never been observed to enter the thermal dominant state (e.g., Cyg X-1).
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