Some fraction of narrow absorption lines are physically associated to the quasar/host-galaxy materials (i.e., intrinsic NALs) like those of BALs and mini-BALs. The relation between these three types of absorption lines has not been understood yet, however one interpretation is that these absorption features correspond to different inclination angles. In this study, we search for intrinsic NALs in 11 BAL/mini-BAL quasar spectra retrieved from VLT/UVES public archive, in order to test a possible relation of intrinsic NALs and BALs/mini-BALs in the geometry models. We use partial coverage analysis to separate intrinsic NALs from ones which are associated to cosmologically intervening materials like foreground galaxies and intergalactic medium (i.e., intervening NALs). We identify one reliable and two possible intrinsic NAL systems out of 36 NAL systems in 9 BAL/mini-BAL quasar spectra after removing two quasars without clear BAL features. In spite of a small sample size, we placed a lower limit on the fraction of BAL/mini-BAL quasars that have at least one intrinsic C IV NAL ($\sim33^{+33}_{-18}\%$). This can be interpreted that intrinsic NAL absorbers exist everywhere regardless of inclination angle. We found that one of the intrinsic NAL systems detected in SDSS J121549.80-003432.1 is located at a large radial distance of R > 130 kpc, using a method of photoionization model with ground/excited-state lines. Considering the wide range of intrinsic NAL absorber distribution in inclination angles and radial distances, it suggests that origins and geometry of them are more complicated than we expected.

中文翻译：

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在 BAL/mini-BAL 类星体光谱中搜索本征 NAL

一部分窄吸收线与类星体/宿主星系材料（即本征 NAL）物理相关，如 BAL 和迷你 BAL 的材料。这三种类型的吸收线之间的关系尚未被理解，但一种解释是这些吸收特征对应于不同的倾角。在这项研究中，我们在从 VLT/UVES 公共档案中检索的 11 个 BAL/mini-BAL 类星体光谱中搜索本征 NAL，以测试几何模型中本征 NAL 和 BAL/mini-BAL 的可能关系。我们使用部分覆盖分析将内在 NAL 与与宇宙学干预材料（如前景星系和星系际介质）（即干预 NAL）相关的 NAL 分开。在去除两个没有明确 BAL 特征的类星体后​​，我们从 9 个 BAL/mini-BAL 类星体光谱中的 36 个 NAL 系统中识别出一个可靠的和两个可能的内在 NAL 系统。尽管样本量很小，但我们对具有至少一个内在 C IV NAL 的 BAL/mini-BAL 类星体的比例设置了下限 ($\sim33^{+33}_{-18}\%$) . 这可以解释为无论倾斜角度如何，内在的 NAL 吸收剂都存在于任何地方。我们发现在 SDSS J121549.80-003432.1 中检测到的一个固有 NAL 系统位于 R > 130 kpc 的大径向距离处，使用具有基态/激发态线的光电离模型方法。考虑到倾斜角和径向距离的内在 NAL 吸收器分布范围很广，这表明它们的起源和几何形状比我们预期的要复杂。