EDIBLES巡天. VIII. 弥漫星际带的谱带轮廓对齐
The EDIBLES Survey. VIII. Band profile alignment of diffuse interstellar bands
AI总结：
该研究改编时间序列对齐并结合聚类分析EDIBLES光谱，识别出8个强度与轮廓均相关的DIB族、4个新可见光DIB及高度相关的6614–6521 Å对。
摘要：
背景：已有许多研究尝试识别谱带强度完全相关的弥漫星际带（DIBs）族。尽管在对广义DIB族进行分类方面已付出巨大努力并获得重要洞见，但尚未有任何族以足够的精度或统计显著性被识别，以证明一系列选定的DIBs源自同一载体。这可部分归因于仅使用等值宽度来建立DIB族。目标：作为策略上的改变，我们搜索在谱带强度和轮廓形状上均高度相关的DIBs。该方法提高了相关DIBs属于同一族并源自同一载体分子的可能性。我们还搜索DIB轮廓族与原子星际谱线之间的相关性，旨在从化学上进一步约束可能的DIB载体。方法：我们改编了著名的时间序列对齐方法以执行光谱对齐，即DIB对齐。在第二步中，我们使用聚类分析来分析对齐结果。该方法需要具有统计显著性的DIB视线数据集。ESO弥漫星际带大型探索巡天（EDIBLES）数据完全适合此应用。结果：我们报告了8个强度和轮廓相关的DIB族，以及通过DIB对齐发现的4个此前未报告的可见光范围DIBs。所有轮廓族成员在谱带强度上的Pearson相关系数均高于0.9。特别地，我们报告了6614–6521 Å DIB对，其中两个DIBs均显示相同的三峰子结构，并具有前所未有的0.9935的谱带强度Pearson相关系数。所提出的方法开辟了新视角，可指导实验室寻找DIB载体。
英文摘要：
Context: There have been many attempts to identify families of diffuse interstellar bands (DIBs) with perfectly correlating band strengths. Although major efforts have been made to classify broadly based DIB families and important insights have been gained, no family has been identified with sufficient accuracy or statistical significance to prove that a series of selected DIBs originates from the same carrier. This can be attributed in part to the exclusive use of equivalent widths to establish DIB families. Aims: In a change of strategy, we search for DIBs that are highly correlated in both band strength and profile shape. This approach increases the chance of correlating DIBs being members of one family and originating from the same carrier molecule. We also search for correlations between DIB profile families and atomic interstellar lines, with the goal of further chemically constraining possible DIB carriers. Methods: We adapted the well-known method of time-series alignment to perform a spectral alignment; that is, DIB alignment. In a second step, we analysed the alignment results using a clustering analysis. This method required a statistically significant data set of DIB sight lines. The ESO Diffuse Interstellar Bands Large Exploration Survey (EDIBLES) data were perfectly suited for this application. Results: We report eight DIB families with correlating strengths and profiles, as well as four previously unreported DIBs in the visual range, found using DIB alignment. All profile family members show Pearson correlation coefficients in band strength higher than 0.9. In particular, we report the 6614 - 6521 AA DIB pair, in which both DIBs show the same triple-peak substructure and an unprecedented band strength Pearson correlation coefficient of 0.9935. The presented approach opens up new perspectives that can guide the laboratory search for DIB carriers.
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