标题： 星际消光曲线的扩展相关性 显示英文标题

标题： Extended correlations between diffuse interstellar bands

摘要： 通过对阿帕奇峰天文台（APO）的559条弥漫星际谱带（DIBs）的综合目录进行系统分析，该分析扩展到了较弱的DIBs，这些DIBs分布在25条视线方向上，具有不同的星际特性。 主要结果如下：1）与C2相关的DIBs数量的扩展，即那些需要非常受保护的星际区域以使它们的载体能够抵御紫外光解离的DIBs。 基于与参考C2和zeta DIBs的相关性，与UV偏好的（sigma）DIBs的反相关性，以及在屏蔽和未屏蔽视线中的强度比值，我们提出了12个新的C2候选者和34个可能的“与C2相关的”DIBs（大多数在lambda < 5950 A），除了大约20个已知确认的C2 DIBs之外。 通过这些补充，C2 DIBs的普查可能接近完成。 2）我们发现，一组研究较少的DIBs在HD 175156和HD 148579的一条或两条视线中的强度被强烈增强。 这个暂定的类别，目前用“chi”表示，可能包括多达50-100个成员，其中一半在lambda > 6000 A，并且一些C2 DIBs。 这些可能的增强可能反映了它们的载体在这些视线中的星际介质中尚未识别的具体形成过程。 五个非常宽的DIBs的波长可能匹配，包括三个“chi” DIBs，与最近通过行动光谱测量到的强带，这可能有利于一些长碳链和环作为某些DIBs的载体。 这些相关性和发现证明了进一步的理论和实验室努力的必要性，以提高我们对各种碳链和环及其可能在弥漫星际介质中的形成和破坏的复杂物理、光谱学和化学的理解。 显示英文摘要

摘要： The systematic analysis of the correlations between diffuse interstellar bands (DIBs) is extended to weak DIBs through the comprehensive catalogue of the Apache Peak Observatory (APO) of 559 DIBs in 25 lines of sight with diverse interstellar properties. The main results are the following: 1) An extension of the number of DIBs identified to be related to C2, that is, those that need very shielded interstellar regions for their carriers to survive UV photo-dissociation. Based on the correlations with the reference C2 and zeta DIBs, anticorrelations with UV-favoured (sigma) DIBs, and the strength ratios in shielded and unshielded sight lines, we propose 12 new C2 candidates and 34 possible "C2-related" DIBs (mostly at lambda < 5950 A ) in addition to the ~20 known confirmed C2 DIBs. With these additions, the census of C2 DIBs might approach completion. 2) We discovered that the intensities of a large set of poorly studied DIBs are strongly enhanced in one or two of the sight lines of HD 175156 and HD 148579. This tentative class, denoted "chi" for the time being, might include up to 50-100 members, half at lambda > 6000 A , and a number of C2 DIBs. These possible enhancements might reflect specific formation processes of their carriers that are yet to be identified in the interstellar medium of these two sight lines. The possible matches of the wavelength of five very broad DIBs, including three "chi" DIBs, with the strong bands that were recently measured by action spectroscopy might favour some long carbon chains and rings as carriers of some DIBs. These correlations and findings justify further theoretical and laboratory efforts for improving our understanding of the complex physics, spectroscopy, and chemistry of the various carbon chains and rings, and their possible formation and destruction in the diffuse interstellar medium.