MCG-6-30-15的X射线吸收分析：三种运动学系统的识别
X-Ray Absorption Analysis of MCG-6-30-15: Discerning Three Kinematic Systems
摘要：
通过分析钱德拉天文台上的HETG光谱仪获得的MCG-6-30-15的X射线光谱，我们确定了三个运动学上不同的吸收系统;两个流出成分固有的MCG-6-30-15，和一个本地z = 0。在-100 +/-50 km/s^-1的速度下，缓慢的外流具有很大的电离范围，这表现为Fe的24种不同电荷态的吸收，这使得能够详细重建吸收测量分布（AMD）。AMD的电离参数跨越了5个数量级：-1.5 < log xi < 3.5（cgs单位），总柱密度为N_H =（5.3 +/- 0.7）x 10^21 cm^-2。在-1900 +/-150 km s^-1处的快速外流有一个定义明确的电离参数，log xi = 3.82 +/-0.03（cgs单位），柱密度N_H = 8.1 +/-0.7 x 10^22 cm^-2。假设这个组成部分是一个薄的、均匀的球壳，它可以被估计位于距离\agn中心11光日的范围内。第三种成分在较低的氧电荷态O^+1 - O^+6中检测得最清楚，过去曾与快速流出相混淆，但在这里被确定为局域气体z = 0，总柱密度N_H只有几个10^20 cm^-2。最后，我们利用HETGS优异的光谱分辨率，并使用目前的光谱来确定以前不确定的氧内壳层线的静止帧波长。
英文摘要：
By analyzing the X-ray spectrum of MCG-6-30-15 obtained with the HETG spectrometer on board the Chandra Observatory, we identify three kinematically distinct absorption systems; two outflow components intrinsic to MCG-6-30-15, and one local at z = 0. The slow outflow at -100 +/- 50 km s^-1 has a large range of ionization manifested by absorption from 24 different charge states of Fe, which enables a detailed reconstruction of the absorption measure distribution (AMD). This AMD spans five orders of magnitude in ionization parameter: -1.5 < log xi < 3.5 (cgs units), with a total column density of N_H = (5.3 +/- 0.7) x 10^21 cm^-2. The fast outflow at -1900 +/- 150 km s^-1 has a well defined ionization parameter with log xi = 3.82 +/- 0.03 (cgs units) and column density N_H = 8.1 +/- 0.7 x 10^22 cm^-2. Assuming this component is a thin, uniform, spherical shell, it can be estimated to lie within 11 light days of the \agn center. The third component, most clearly detected in the lower oxygen charge states O^+1 - O^+6, has been confused in the past with the fast outflow, but is identified here with local gas z = 0 and a total column density N_H of a few 10^20 cm^-2. Finally, we exploit the excellent spectral resolution of the HETGS and use the present spectrum to determine the rest-frame wavelengths of oxygen inner-shell lines that were previously uncertain.
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