Detection of two interstellar polycyclic aromatic hydrocarbons via spectral matched filtering
Detection of two interstellar polycyclic aromatic hydrocarbons via spectral matched filtering
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DOI：
10.1126/science.abb7535
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发表时间：
2021-03-19
期刊：
影响因子：
56.9
通讯作者：
McCarthy, Michael C.
中科院分区：
文献类型：
--
作者：
McGuire, Brett A.;Loomis, Ryan A.;McCarthy, Michael C.
不明红外发射带在许多天文来源中无处不在。这些谱带即使不是一致的，也被广泛地归因于多环芳烃(PAH)分子的集体排放，然而在太空中还没有发现这类物质的单一物种。利用来自绿岸望远镜的射电数据的光谱匹配滤波，我们在星际介质中检测到了两种氰基功能化的多环芳烃，1-和2-氰化萘。在TMC-1分子云中观察到这两个双环分子。在这篇文章中，我们讨论了由较小的有机前体分子原位生成多环芳烃的潜在途径。
Unidentified infrared emission bands are ubiquitous in many astronomical sources. These bands are widely, if not unanimously, attributed to collective emissions from polycyclic aromatic hydrocarbon (PAH) molecules, yet no single species of this class has been identified in space. Using spectral matched filtering of radio data from the Green Bank Telescope, we detected two nitrile-group-functionalized PAHs, 1- and 2-cyanonaphthalene, in the interstellar medium. Both bicyclic ring molecules were observed in the TMC-1 molecular cloud. In this paper, we discuss potential in situ gas-phase PAH formation pathways from smaller organic precursor molecules.