Correlation between UV resilience and wavelength of narrow diffuse interstellar bands
Correlation between UV resilience and wavelength of narrow diffuse interstellar bands
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DOI：
10.1051/0004-6361/201937071
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发表时间：
2020-03
影响因子：
6.5
通讯作者：
A. Omont;Holger F. Bettinger
中科院分区：
文献类型：
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作者：
A. Omont;Holger F. Bettinger
星际弥散带（DIB）的携带者仍然需要被识别。在最近的一篇论文中，我们报道了DIB波长与其载体的表观UV弹性（或增强）之间的相关性。我们提出，这可能是一个指示的共轭伸长分子中的DIB载体的重要作用。本文的目的是进一步了解这种相关性的起源。对文献报道的HD 183143和/或HD 204827视线上的509个光学DIB的分析表明，这种相关性主要意味着386个带宽<1.1 nm的窄DIB，其中包括大多数已鉴定的C_2和C_4族DIB，而123个较宽的DIB中的大多数，包括已鉴定的σ DIB，并没有显示出这种相关性。我们提出了一个可能的起源，这种相关性从很强的大共轭细长分子，如碳链，聚并苯，或其他catacondensed多环芳烃带。如果这些窄DIB的振子强度大于等于1，那么它们所有载流子中所含的碳总量只占星际碳的很小一部分。锁定在更宽DIB的载体中的碳的量更高，特别是如果它们的振子强度明显较弱。
Carriers of diffuse interstellar bands (DIBs) still need to be identified. In a recent paper, we reported a correlation between the DIB wavelength and the apparent UV resilience (or boost) of their carriers. We proposed that this might be an indication of the important role of conjugated elongated molecules among the DIB carriers. The aim of this paper is to further understand the origin of this correlation. The analysis of 509 optical DIBs on the lines of sight of HD 183143 and/or HD 204827 reported in the literature shows that this correlation mainly implies the 386 narrow DIBs with a band width <1.1 Å, which include most of the identified DIBs of the C2 and ζ families, while the majority of the 123 broader DIBs, including the identified σ DIBs, do not display such a correlation. We present a possible origin of this correlation from very strong bands of large conjugated elongated molecules, such as carbon chains, polyacenes, or other catacondensed polycyclic aromatic hydrocarbons. The total amount of carbon contained in all the carriers of these narrow DIBs is a very small fraction of the interstellar carbon if their oscillator strengths are ≥1. The amount of carbon locked in the carriers of the broader DIBs is higher, especially if their oscillator strengths are significantly weaker.