10 kpc尺度的Seyfert星系外流：IRAS F22456-5125的HST/COS观测
A 10 kpc Scale Seyfert Galaxy Outflow: HST/COS Observations of IRAS F22456-5125
摘要：
我们目前的低z活动星系核IRAS-F22456-5125的紫外光谱的哈勃太空望远镜上的宇宙起源摄谱仪获得的分析。频谱揭示了六个主要的运动组成部分，跨越的速度范围高达800公里s-1，这是第一次观察到槽与CII，CIV，NV，SiII，SiIII，SiIV和SIV。我们还获得的OVI槽的数据，我们比较那些可从较早的FUSE时代。从这些离子测得的柱密度，使我们能够得到一个良好的约束光电离解决方案，为每个流出组件。这些运动学分量中的两个示出了与从SiII\和CII的激发态的转变相关联的波谷。从这些槽推断出的数密度，结合推导出的电离参数，使我们能够确定从中央源到这些流出分量的距离。我们发现这些成分的距离约为10 kpc。得出的距离和数量密度与流出是银河风的一部分是一致的。
英文摘要：
We present analysis of the UV-spectrum of the low-z AGN IRAS-F22456-5125 obtained with the Cosmic Origins Spectrograph on board the Hubble Space Telescope. The spectrum reveals six main kinematic components, spanning a range of velocities of up to 800 km s-1, which for the first time are observed in troughs associated with CII, CIV, NV, SiII, SiIII, SiIV and SIV. We also obtain data on the OVI troughs, which we compare to those available from an earlier FUSE epoch. Column densities measured from these ions allow us to derive a well-constrained photoionization solution for each outflow component. Two of these kinematic components show troughs associated with transitions from excited states of SiII\ and CII. The number density inferred from these troughs, in combination with the deduced ioinization parameter, allows us to determine the distance to these outflow components from the central source. We find these components to be at a distance of ~ 10 kpc. The distances and the number densities derived are consistent with the outflow being part of a galactic wind.
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