追踪z=0.334 FeLoBAL的流出：FBQS J1151 +3822中低电离吸收体的新约束
Tracing the Outflow of a z=0.334 FeLoBAL: New Constraints from Low-Ionization Absorbers in FBQS J1151+3822
摘要：
我们首次证明FBQS J1151+3822是一个铁低电离宽吸收线类星体（FeLoBAL类星体），是这类星体中第二亮和第二近的已知例子。他我 * 和Fe II一起作为一个有效的分析工具，使我们能够获得有用的动力学约束，而不需要假设任何特定的加速模型的流出光电离模型。主要流出物的对数电离参数为-1.5，对数氢密度[cm^（-3）]为5.5 ~ 8，对数氢柱密度[cm^（-2）]为21.7 ~ 21.9，吸收半径为7.2 ~ 127 pc，动力学光度为测热光度的0.16%~ 4.5%。我们得到的视线覆盖分数~0.25强铁II，~0.5 He I*，和~0.6 Mg II。在2005年至2011年期间，较弱的Fe II和Mn II的吸收线出现了更窄和更浅的吸收线，流出速度约为3400 km/s，这表明致密的核心可能已经在主要流出物内部凝聚。对文献的考虑可能表明，FBQS J1151+3822流出是一种罕见且独特的FeLoBALs亚类的成员，具有高密度和相应的小吸收半径。然而，我们发现，这样的外流不一定是一个独特的子类，他们的明显罕见可能是一个症状的选择偏见的研究使用密度敏感线。
英文摘要：
We show for the first time that FBQS J1151+3822 is an iron low-ionization broad absorption line quasar (FeLoBAL QSO), the second-brightest and second-closest known example of this class. He I* and Fe II together act as an effective analytical tool, allowing us to obtain useful kinematic constraints from photoionization models of the outflow without needing to assume any particular acceleration model. The main outflow's log ionization parameter is -1.5, the log hydrogen density [cm^(-3)] 5.5 to 8, the log hydrogen column density [cm^(-2)] 21.7 to 21.9, the absorption radius 7.2 to 127 pc, and the kinetic luminosity 0.16% to 4.5% of the bolometric luminosity. We obtain line-of-sight covering fractions of ~0.25 for strong Fe II, ~0.5 for He I*, and ~0.6 for Mg II. Narrower and shallower absorption lines from weaker Fe II and Mn II with outflow velocity ~3400 km/s have appeared between 2005 and 2011, suggesting that dense cores may have condensed inside the main outflow. Consideration of the literature might suggest that the FBQS J1151+3822 outflow is a member of a rare and distinct sub-class of FeLoBALs with high densities and correspondingly small absorption radii. We find, however, that such outflows are not necessarily a distinct sub-class, and that their apparent rarity could be a symptom of selection bias in studies using density-sensitive lines.
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