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The NASA Ames PAH IR Spectroscopic Database: The Laboratory Spectra
The Astrophysical Journal Supplement Series ( IF 8.7 ) Pub Date : 2020-12-01 , DOI: 10.3847/1538-4365/abc2c8
A. L. Mattioda 1 , D. M. Hudgins 2 , C. Boersma 1 , C. W. Bauschlicher Jr. 3 , A. Ricca 1, 4 , J. Cami 4, 5, 6 , E. Peeters 4, 5, 6 , F. Snchez de Armas 4 , G. Puerta Saborido 4 , L. J. Allamandola 1
Affiliation  

The astronomical emission features, formerly known as the unidentified infrared bands, are now commonly ascribed to polycyclic aromatic hydrocarbons (PAHs). The laboratory experiments and computational modeling performed at NASA Ames Research Center generated a collection of PAH IR spectra that have been used to test and refine the PAH model. These data have been assembled into the NASA Ames PAH IR Spectroscopic Database (PAHdb). PAHdb’s library of computed spectra, currently at version 3.20, contains data on more than 4000 species and the library of laboratory-measured spectra, currently at version 3.00, contains data on 84 species. The spectra can be perused and are available for download at www.astrochemistry.org/pahdb/. This paper introduces the library of laboratory-measured spectra. Although it has been part of PAHdb since its inception, the library of laboratory-measured spectra lacked a proper description in the literature. Here, the experimental methods used to obtain the data are described in detail, an overview of the contents of the experimental library is given, and specific tools developed to analyze and interpret astronomical spectra with the laboratory data are discussed. In addition, updates to the website, documentation and software tools since our last reporting are presented. Software tools to work with the spectroscopic libraries are being developed actively and are available at GitHub. Lastly, a comprehensive demonstration showing how the laboratory-measured data can be applied to explore absorption features in observations toward embedded sources is presented. This demonstration suggests that PAHs very likely contribute to interstellar absorption spectra associated with dense clouds and underscores the need for further IR spectroscopic studies of PAHs trapped in water ice.



中文翻译:

NASA Ames PAH IR 光谱数据库:实验室光谱

天文发射特征,以前称为未识别的红外波段,现在通常归因于多环芳烃 (PAH)。在 NASA 艾姆斯研究中心进行的实验室实验和计算建模生成了一组 PAH IR 光谱,这些光谱已用于测试和改进 PAH 模型。这些数据已汇总到 NASA Ames PAH IR 光谱数据库 (PAHdb) 中。PAHdb 的计算光谱库(当前版本为 3.20)包含 4000 多种物种的数据,而实验室测量光谱库(当前版本为 3.00)包含 84 个物种的数据。可以仔细阅读光谱,并可从 www.astrochemistry.org/pahdb/ 下载。本文介绍了实验室测量光谱库。虽然它自成立以来一直是 PAHdb 的一部分,实验室测量的光谱库在文献中缺乏适当的描述。在这里,详细描述了用于获取数据的实验方法,概述了实验库的内容,并讨论了开发用于分析和解释实验室数据的天文光谱的特定工具。此外,还提供了自我们上次报告以来对网站、文档和软件工具的更新。用于光谱库的软件工具正在积极开发中,可在 GitHub 上获得。最后,展示了如何应用实验室测量数据来探索对嵌入式源的观察中的吸收特征的综合演示。

更新日期:2020-12-01
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