论文标题
在BAL/MINI-BAL类星体光谱中搜索固有的NALS
Search for intrinsic NALs in BAL/mini-BAL quasar spectra
论文作者
论文摘要
狭窄的吸收系的一部分在物理上与类星体/宿主 - 甘拉克斯材料（即固有的NALS）相关联，如香脂和迷你 - 巴尔斯的材料。这三种类型的吸收系之间的关系尚未了解，但是一种解释是这些吸收特征对应于不同的倾斜角。在这项研究中，我们搜索从VLT/Uves公共档案中检索的11个BAL/MINI-BAL类星体光谱中的固有NAL，以测试几何模型中固有的NALS和BALS/MINI-BALS的可能关系。我们使用部分覆盖分析将内在的NAL与与宇宙学中间材料（如前景星系和播层间介质（即中间的NALS）相关的材料）相关的NAL。我们在9个BAL/MINI-BAL类星体光谱中，在没有明确的BAL特征的两个类星体后，在9个BAL/MINI-BAL类星体光谱中确定了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Bal/mini-bal carsars的比例保持了下限，这些BAL/MINI-BAL类星体具有至少一个内在的C IV NAL（$ \ sim33^{+33} _ { - 18} \％$）。这可以解释出，无论倾斜角度如何，无处不在的固有的NAL吸收器。我们发现，使用一种带有地面/兴奋状态线的光电离电模型，SDSS J121549.80-003432.1中检测到的内在NAL系统之一位于r> 130 kpc的较大径向距离。考虑到倾斜角度和径向距离的各种固有的NAL吸收器分布范围，这表明它们的起源和几何形状比我们预期的要复杂。
Some fraction of narrow absorption lines are physically associated to the quasar/host-galaxy materials (i.e., intrinsic NALs) like those of BALs and mini-BALs. The relation between these three types of absorption lines has not been understood yet, however one interpretation is that these absorption features correspond to different inclination angles. In this study, we search for intrinsic NALs in 11 BAL/mini-BAL quasar spectra retrieved from VLT/UVES public archive, in order to test a possible relation of intrinsic NALs and BALs/mini-BALs in the geometry models. We use partial coverage analysis to separate intrinsic NALs from ones which are associated to cosmologically intervening materials like foreground galaxies and intergalactic medium (i.e., intervening NALs). We identify one reliable and two possible intrinsic NAL systems out of 36 NAL systems in 9 BAL/mini-BAL quasar spectra after removing two quasars without clear BAL features. In spite of a small sample size, we placed a lower limit on the fraction of BAL/mini-BAL quasars that have at least one intrinsic C IV NAL ($\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.
