Discovery of a Remarkably Powerful Broad Absorption-line Quasar Outflow in SDSS J135246.37+423923.5
Discovery of a Remarkably Powerful Broad Absorption-line Quasar Outflow in SDSS J135246.37+423923.5
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DOI：
10.3847/1538-4357/ab6f72
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发表时间：
2020-03-01
影响因子：
4.9
通讯作者：
Richards, Gordon T.
中科院分区：
文献类型：
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作者：
Choi, Hyunseop;Leighly, Karen M.;Richards, Gordon T.
类星体光谱的宽吸收线（BAL）特征揭示了中心超大质量黑洞能量流出的明确特征，因此，BAL类星体是研究发光类星体对星系反馈的潜在过程的主要目标。我们使用新的光谱合成代码SimBAL分析了铁低电离宽吸收线类星体（FeLoBAL） SDSS.J135246.37+423923.5的“重叠槽”-紫外光谱，发现了一个异常快速和高能的BAL流出。我们的分析显示，流出速度接近38,000 km s(-1)，速度宽度接近10,000 km s(-1)，这是迄今为止FeLoBAL测量到的最大流出速度。流出气体柱密度为log(NH)，约为23.2 (cm(-1))，对数动力学光度log L-KE约为48.1 (erg s(-1))，超过类星体的热光度，能量足以有效驱动类星体反馈。流出的能量估计远远大于先前报道的任何BAL物体的估计。该对象还显示“异常变红”和我们能够用SimBAL建模的重要分散组件。我们在一个额外的零速度吸收成分中发现了辐射过滤的第一个明确案例，该成分需要一个吸收连续体来产生观察到的特定吸收谱线（Mg II， Al III和Al II），而不会产生高电离谱线，如C IV。
Broad absorption-line (BAL) features in quasar spectra reveal an unambiguous signature of energetic outflows from central supermassive black holes, and thus, BAL quasars are prime targets for investigating the potential process of luminous quasar feedback on galaxies. We analyzed the rest-UV spectrum of an "overlapping trough" iron lowionization broad absorption-line quasar (FeLoBAL) SDSS.J135246.37+423923.5 using the novel spectral synthesis code SimBAL and discovered an extraordinarily fast and energetic BAL outflow. Our analysis revealed outflow velocities reaching similar to-38,000 km s(-1) with a velocity width of similar to 10,000 km s(-1), which is the largest FeLoBAL outflow velocity measured to date. The column density of the outflow gas is log(NH) similar to 23.2 (cm(-1)) with the log kinetic luminosity log L-KE similar to 48.1 (erg s(-1)), which exceeds the bolometric luminosity of the quasar and is energetic enough to effectively drive quasar feedback. The energy estimate for the outflow is far greater than the estimates from any BAL object previously reported. The object also shows "anomalous reddening" and a significant scattered component that we were able to model with SimBAL. We found the first definitive case for radiation filtering in an additional zero-velocity absorption component that required an absorbed continuum to produce the particular absorption lines observed (Mg II, Al III, and Al II) without also producing the high-ionization lines such as C IV.