用Suzaku约束Fairall 9中黑洞的自旋
Constraining the Spin of the Black Hole in Fairall 9 with Suzaku
摘要：
我们报告的光谱拟合的结果，从168千秒朱雀观测的Seyfert-1星系Fairall 9获得的数据。在30 keV的能量范围内可以清楚地检测到该源。观察到的光谱相当简单，它是由一个软过剩和磁盘反射的幂律很好地描述。由于X射线成像光谱仪（XIS）中CCD的分辨率，可以检测到宽的铁谱线，并很容易从不同的窄组分中分离出来。宽线显示是不对称的，与圆盘起源一致。我们适合的XIS和硬X射线探测器（HXD）光谱与相对论模糊磁盘反射模型。假设内盘延伸到最里面的稳定圆形轨道，最佳拟合模型意味着黑洞的自旋参数为a = 0.60（7），并且在高置信度下排除了极值。我们讨论了这一结果的背景下，塞弗特观测和模型的宇宙分布的黑洞自旋。
英文摘要：
We report on the results of spectral fits made to data obtained from a 168 ksec Suzaku observation of the Seyfert-1 galaxy Fairall 9. The source is clearly detected out to 30 keV. The observed spectrum is fairly simple; it is well-described by a power-law with a soft excess and disk reflection. A broad iron line is detected, and easily separated from distinct narrow components owing to the resolution of the CCDs in the X-ray Imaging Spectrometer (XIS). The broad line is revealed to be asymmetric, consistent with a disk origin. We fit the XIS and Hard X-ray Detector (HXD) spectra with relativistically-blurred disk reflection models. With the assumption that the inner disk extends to the innermost stable circular orbit, the best-fit model implies a black hole spin parameter of a = 0.60(7) and excludes extremal values at a high level of confidence. We discuss this result in the context of Seyfert observations and models of the cosmic distribution of black hole spin.
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