Search for intrinsic NALs in BAL/mini-BAL quasar spectra
Search for intrinsic NALs in BAL/mini-BAL quasar spectra
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DOI：
10.1093/mnras/staa2793
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发表时间：
2020-09
影响因子：
4.8
通讯作者：
D. Itoh;T. Misawa;Takashi Horiuchi;K. Aoki
中科院分区：
文献类型：
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作者：
D. Itoh;T. Misawa;Takashi Horiuchi;K. Aoki
窄吸收线的一部分与类星体/宿主星系物质物理相关（即，固有NAL），如巴尔斯和迷你BALs的那些。这三种类型的吸收线之间的关系尚未被理解，然而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，我们在VLT/UVES公共档案中检索到的11个BAL/mini-BAL类星体光谱中寻找本征NAL，以检验几何模型中本征NAL与巴尔斯/mini-BAL的可能关系。我们使用部分覆盖分析来分离内在的NAL与那些与宇宙学上的介入物质如前景星系和星系际介质（即，介入NAL）。我们确定了一个可靠的和两个可能的内在NAL系统的36 NAL系统在9 BAL/迷你BAL类星体光谱后，删除两个类星体没有明确的BAL功能。尽管样本量很小，但我们对具有至少一个本征C IV NAL的BAL/mini-BAL类星体的比例设置了下限（$\sim 33 ^{+33}_{-18}\%$）。这可以解释为，无论倾斜角度如何，固有NAL吸收体都存在于各处。利用基态/激发态线光电离模型，我们发现SDSS J121549.80-003432.1中发现的一个本征NAL系统位于R > 130 kpc的大径向距离处。考虑到本征NAL吸收体在倾角和径向距离上的广泛分布，这表明它们的起源和几何形状比我们预期的要复杂得多。
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.