GX 339-4中圆盘光谱拟合对自旋测定的限制
Limits on spin determination from disc spectral fitting in GX 339-4
摘要：
我们试图限制黑洞自旋GX 339-4的光谱拟合盘主导的数据使用RXTE光谱从最近的三个爆发。我们使用目前最好的光盘发射模型，包括完整的辐射转移通过光球，而不是假设从每个半径的固有发射有一个（色温校正）黑体光谱。结果强烈地依赖于鲜为人知的双星系统参数，但我们发现对于任何大于6 kpc的距离，a<0.9是严格的上限，假设轨道倾角与内盘的轨道倾角相同。相比之下，根据该天体的磁力线轮廓拟合得出的0.935 +/-0.01（统计）+/-0.01（系统）的更高自旋要求内盘偏离轨道倾角超过20度。虽然其中一些数据集被仪器堆积所扭曲，但相同的自旋/倾斜约束来自于没有堆积的数据，因此这两种测量自旋的技术之间存在真正的冲突。我们认为，光盘光谱拟合更有可能是强大的，因此，仍然有问题要了解的铁线配置文件。
英文摘要：
We attempt to constrain the black hole spin in GX 339-4 from spectral fitting of disc dominated data using RXTE spectra from the three most recent outbursts. We use the best current models for the disc emission, including full radiative transfer through the photosphere rather than assuming that the intrinsic emission from each radius has a (colour temperature corrected) blackbody spectrum. The results strongly depend on the poorly known binary system parameters, but we find a strict upper limit of a<0.9 for any distance greater than 6 kpc, assuming that the orbital inclination is the same as that of the inner disc. By contrast, the higher spin of 0.935 +/- 0.01 (statistical) +/-0.01 (systematic) claimed from fitting the iron line profile in this object requires that the inner disc is misaligned by over 20 degrees from the orbital inclination. While some of these datasets are distorted by instrumental pileup, the same spin/inclination constraints are derived from data which are not piled up, so there is a real conflict between the two techniques to measure spin. We argue that the disc spectral fits are more likely to be robust hence that there are still issues to be understood in the iron line profile.
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