Multiple origins for the DLA at zabs = 0.313 toward PKS 1127–145 indicated by a complex dust depletion pattern of Ca, Ti, and Mn

Multiple origins for the DLA at zabs = 0.313 toward PKS 1127–145 indicated by a complex dust depletion pattern of Ca, Ti, and Mn
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DLA 在 zabs = 0 313 处朝向 PKS 1127â145 的多个起源,由 Ca、Ti 和 Mn 的复杂尘埃消耗模式表明

DOI:
10.1051/0004-6361/201730984
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发表时间:
2018
影响因子:
6.5
通讯作者:
Richter
Richter
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Richter

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我们研究了星系内和星系周围光学厚气体的尘埃耗竭特性及其来源。我们详细地研究了类星体PKS 1127145前方多组分阻尼莱曼(DLA)吸收体中钛、锰和钙的尘埃耗尽模式。}我们根据甚大望远镜上的UVES仪器获得的光学高分辨率数据,对与DLA相关的CaII、MnII、TiII和NaI的吸收剖面进行了详细的光谱分析。我们得到了上述离子的柱密度和多普勒参数,并确定了它们的气相丰度,由此我们得出了它们的尘埃耗竭特性。我们比较了这种DLA和其他DLA的钙和钛的耗竭性能。在分析的六种吸收组分中,有一种显示气相中钛和锰的丰度明显不足,这表明这些元素的粉尘枯竭和局部尘气比增加的影响。在这种DLA和其他类似的吸收体中,MnII的丰度与TiIi的丰度非常接近,这意味着这两个离子对尘埃耗尽效应同样敏感。我们的分析表明,向PKS 1127145的DLA具有多个来源。由于其窄的谱线宽度和强烈的尘埃损耗,组分3指向来自PKS 1127145前方一个微弱的LSB星系的中性气盘的存在,而另一个更扩散和更少尘埃的吸收组分可能与各种光学确认的星系团成员之间的相互作用所产生的潮汐气体特征有关。总的来说,次级星系和次级星系中的Mn/CaII比值可能是区分星系内和星系周围中性气体中富尘和贫尘的一个重要指标。
We investigate the dust depletion properties of optically thick gas in and around galaxies and its origin we study in detail the dust depletion patterns of Ti, Mn, and Ca in the multi-component damped Lyman-(DLA) absorber attoward the quasar PKS 1127145.} We performed a detailed spectral analysis of the absorption profiles of CaII, MnII, TiII, and NaI associated with the DLA toward PKS 1127145, based on optical high-resolution data obtained with the UVES instrument at the Very Large Telescope (VLT). We obtained column densities and Doppler-parameters for the ions listed above and determine their gas-phase abundances, from which we conclude on their dust depletion properties. We compared the Ca and Ti depletion properties of this DLA with that of other DLAs. One of the six analyzed absorption components shows a striking underabundance of Ti and Mn in the gas-phase, indicating the effect of dust depletion for these elements and a locally enhanced dust-to-gas ratio. In this DLA and in other similar absorbers, the MnII abundance follows that of TiII very closely, implying that both ions are equally sensitive to the dust depletion effects. Our analysis indicates that the DLA toward PKS 1127145 has multiple origins. With its narrow line width and its strong dust depletion, component 3 points toward the presence of a neutral gas disk from a faint LSB galaxy in front of PKS 1127145, while the other, more diffuse and dust-poor, absorption components possibly are related to tidal gas features from the interaction between the various, optically confirmed galaxy-group members. In general, the Mn/CaII ratio in sub-DLAs and DLAs possibly serves as an important indicator to discriminate between dust-rich and dust-poor in neutral gas in and around galaxies.
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