NGC3516的X射线吸收分析：随着源通量增加快速组分的出现
X-Ray Absorption Analysis of NGC3516: Appearance of Fast Components with Increased Source Flux
摘要：
通过分析2001年和2006年NGC 3516的X射线谱，我们发现NGC 3516的外流运动学结构可以很好地用4个外流分量来描述。不同分量的流出速度分别为350 ± 100 km s-1、1500 ± 150 km s-1、2600 ± 200 km s-1和4000 ± 400 km s-1。z = 0处的局部分量可能与本征分量3混淆。组分1和2具有广泛的电离范围，表现为从Fe的23种不同电荷状态吸收。组分3和4的电离程度更高，并且仅显示出来自Fe的9种不同电荷态的吸收，然而我们能够重建所有四种的吸收测量分布（AMD）。各组分的总柱密度分别为NH =（1.8+- 0.5）X10^22 cm-2、NH =（2.5+- 0.3）X10^22 cm-2、NH =（6.9+- 4.3）X10^22 cm-2和NH =（5.4+- 1.2）X10^22 cm-2。快速分量3和4只出现在2006年的高状态，而不是在2001年，而较慢的分量在这两个时期都存在。另一方面，在2001年或2006年期间，在几天内没有明显的吸收变化。我们发现覆盖因子对线吸收的影响很小。
英文摘要：
By analyzing the X-ray spectra of NGC 3516 from 2001 and 2006 obtained with the HETGS spectrometer on board the Chandra observatory, we find that the kinematic structure of the outflow can be well represented by four outflow components intrinsic to NGC 3516. The outflow velocities of the different components are 350 +-100 km s-1, 1500 +-150 km s-1, 2600 +-200 km s-1 and 4000 +-400 km s-1 for components 1, 2, 3 and 4, respectively. A local component at z = 0 could be confused with intrinsic component 3. Components 1 and 2 have a broad range of ionization manifested by absorption from 23 different charge states of Fe. Component 3 and 4 are more highly ionized and show absorption from only 9 different charge states of Fe, however we were able to reconstruct the absorption measure distribution (AMD) for all four. The total column density of each component is NH = (1.8+- 0.5) X10^22 cm-2, NH = (2.5+- 0.3) X10^22 cm-2, NH = (6.9+- 4.3) X10^22 cm-2 and NH = (5.4+- 1.2) X10^22 cm-2, respectively. The fast components 3 and 4 appear only in the high state of 2006 and not in 2001, while the slower components persist during both epochs. On the other hand, there is no significant absorption variability within days during 2001 or during 2006. We find that covering factor plays a minor role for the line absorption.
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