IRAS 17020+4544中X射线超快外流的UV对应物
UV counterpart of an X-ray ultra-fast outflow in IRAS 17020+4544
摘要：
本文报道了在窄线塞弗特-1星系IRAS 17020+4544中发现的低电离X射线超快外流（UFO）的紫外吸收对应物。UFO的紫外线特征被视为远紫外线光谱中的窄蓝移莱曼α吸收特征，由哈勃太空望远镜（HST）上的宇宙起源光谱仪（COS）拍摄。莱曼α特征被发现是流出的速度为-23430 km/s（0.078 c）。我们进行高分辨率紫外光谱和光电离建模，以研究在HTS/COS光谱中看到的UFO。我们的建模结果表明，紫外线不明飞行物对应于一个低电离，低速度的X射线不明飞行物的组成部分，以前发现的XMM-牛顿的反射光栅光谱仪（RGS）。X射线不明飞行物的其他更高速度和更高电离度的成分在HST/COS光谱中没有被显著检测到，这与我们的光电离计算的预测一致。IRAS 17020+4544中UFO的多重电离和速度分量表明，一个强大的主要UFO夹带并冲击周围介质，导致形成较弱的次要UFO分量，例如在紫外线波段发现的UFO。
英文摘要：
We report on the discovery of a UV absorption counterpart of a low-ionization X-ray ultra-fast outflow (UFO) in the Narrow-Line Seyfert-1 galaxy IRAS 17020+4544. This UV signature of the UFO is seen as a narrow and blueshifted Lyman-alpha absorption feature in the far-UV spectrum, taken with the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST). The Lyman-alpha feature is found to be outflowing with a velocity of -23430 km/s (0.078 c). We carry out high-resolution UV spectroscopy and photoionization modeling to study the UFO that is seen in the HTS/COS spectrum. The results of our modeling show that the UV UFO corresponds to a low-ionization, low-velocity component of the X-ray UFO found previously with XMM-Newton's Reflection Grating Spectrometer (RGS). The other higher-velocity and higher-ionization components of the X-ray UFOs are not significantly detected in the HST/COS spectrum, consistent with predictions of our photoionization calculations. The multiple ionization and velocity components of the UFOs in IRAS 17020+4544 suggest a scenario where a powerful primary UFO entrains and shocks the ambient medium, resulting in formation of weaker secondary UFO components, such as the one found in the UV band.
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