Space Telescope and Optical Reverberation Mapping Project. XI. Disk-wind Characteristics and Contributions to the Very Broad Emission Lines of NGC 5548
Space Telescope and Optical Reverberation Mapping Project. XI. Disk-wind Characteristics and Contributions to the Very Broad Emission Lines of NGC 5548
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DOI：
10.3847/1538-4357/ab9cb2
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
M. Dehghanian;G. Ferland;G. Kriss;B. Peterson;K. Korista;M. Goad;M. Chatzikos;F. Guzmán;G. D. Rosa;M. Mehdipour;J. Kaastra;S. Mathur;M. Vestergaard;D. Proga;T. Waters;M. Bentz;S. Bisogni;W. Brandt;E. Bontà;M. Fausnaugh;J. Gelbord;K. Horne;I. McHardy;R. Pogge;D. Starkey
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文献类型：
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作者：
M. Dehghanian;G. Ferland;G. Kriss;B. Peterson;K. Korista;M. Goad;M. Chatzikos;F. Guzmán;G. D. Rosa;M. Mehdipour;J. Kaastra;S. Mathur;M. Vestergaard;D. Proga;T. Waters;M. Bentz;S. Bisogni;W. Brandt;E. Bontà;M. Fausnaugh;J. Gelbord;K. Horne;I. McHardy;R. Pogge;D. Starkey
2014年，NGC 5548太空望远镜和光学混响映射活动发现了一个为期两个月的异常，当时吸收和发射谱线的变化与连续变化无关。在这段时间内，软X射线部分的内禀光谱已被视线（LOS）遮蔽物强烈吸收，这被解释为盘风的上部。我们的第一篇论文表明，在LOS遮光剂的变化产生的吸收线和连续谱之间的去相关。第二项研究表明，基地的风屏蔽了广泛的发射线区（BLR），导致发射线去相关。在这项研究中，我们提出风通常是透明的，对光谱没有影响。风的性质的变化改变其屏蔽和影响的频谱能量分布（SED）打击的BLR，产生所观察到的去相关。在这项工作中，我们调查的影响，半透明的风上的发射线。我们使用XMM-牛顿，努斯塔，和哈勃太空望远镜的观测来确定风的物理特性模拟的遮蔽。我们发现半透明风可以贡献部分He ii和Fe Kα辐射。它有一个适度的光学深度，电子散射，这解释了在所观察到的速度延迟图中较暗的远侧发射。风产生了在紫外线发射线中看到的非常宽的基底，也可能存在于Fe Kα线中。我们的研究结果强调了在分析中央引擎的物理过程中考虑这种风的影响的重要性。
In 2014 the NGC 5548 Space Telescope and Optical Reverberation Mapping campaign discovered a two-month anomaly when variations in the absorption and emission lines decorrelated from continuum variations. During this time the soft X-ray part of the intrinsic spectrum had been strongly absorbed by a line-of-sight (LOS) obscurer, which was interpreted as the upper part of a disk wind. Our first paper showed that changes in the LOS obscurer produces the decorrelation between the absorption lines and the continuum. A second study showed that the base of the wind shields the broad emission-line region (BLR), leading to the emission-line decorrelation. In that study, we proposed the wind is normally transparent with no effect on the spectrum. Changes in the wind properties alter its shielding and affect the spectral energy distribution (SED) striking the BLR, producing the observed decorrelations. In this work we investigate the impact of a translucent wind on the emission lines. We simulate the obscuration using XMM-Newton, NuSTAR, and Hubble Space Telescope observations to determine the physical characteristics of the wind. We find that a translucent wind can contribute a part of the He ii and Fe Kα emission. It has a modest optical depth to electron scattering, which explains the fainter far-side emission in the observed velocity-delay maps. The wind produces the very broad base seen in the UV emission lines and may also be present in the Fe Kα line. Our results highlight the importance of accounting for the effects of such winds in the analysis of the physics of the central engine.