Atomic Data Revisions for Transitions Relevant to Observations of Interstellar, Circumgalactic, and Intergalactic Matter
Atomic Data Revisions for Transitions Relevant to Observations of Interstellar, Circumgalactic, and Intergalactic Matter
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DOI：
10.3847/1538-4365/aa6d84
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发表时间：
2017-05-01
影响因子：
8.7
通讯作者：
Bogdanovich, Pavel
中科院分区：
文献类型：
--
作者：
Cashman, Frances H.;Kulkarni, Varsha P.;Bogdanovich, Pavel
从天体物理光谱学测量星系中的元素丰度在很大程度上取决于所使用的原子数据。为了使社区能够获得最新的原子数据，我们提供了一份关于天体物理感兴趣的关键重元素(比原子序数5更重)的波长为911.753埃(H I莱曼极限)的共振吸收线的选定原子数据的汇编。特别是，我们关注在银河系星际介质(ISM)、银河系和/或其他星系的环星系介质(CGM)以及星际介质(IGM)中观察到的那些离子的跃迁。我们提供波长、振荡器强度、相关的精度等级以及振荡器强度测定的参考。我们还试图比较和评估最近的振子强度测定。对于已经更新振荡器强度值的大约22%的线路，以前的值和更新的值之间的差异是。0.1Dex。我们的汇编将成为ISM吸收线研究的有用资源，以及通过视线追踪类星体和伽马射线爆发的CGM和IGM的研究。星系对背景星系光的吸收的研究(包括由未来几代超大望远镜实现的研究)也将受益于我们的汇编。
Measurements of element abundances in galaxies from astrophysical spectroscopy depend sensitively on the atomic data used. With the goal of making the latest atomic data accessible to the community, we present a compilation of selected atomic data for resonant absorption lines at wavelengths longward of 911.753 angstrom (the H I Lyman limit), for key heavy elements (heavier than atomic number 5) of astrophysical interest. In particular, we focus on the transitions of those ions that have been observed in the Milky Way interstellar medium (ISM), the circumgalactic medium (CGM) of the Milky Way and/or other galaxies, and the intergalactic medium (IGM). We provide wavelengths, oscillator strengths, associated accuracy grades, and references to the oscillator strength determinations. We also attempt to compare and assess the recent oscillator strength determinations. For about 22% of the lines that have updated oscillator strength values, the differences between the former values and the updated ones are. 0.1 dex. Our compilation will be a useful resource for absorption line studies of the ISM, as well as studies of the CGM and IGM traced by sight lines to quasars and gamma-ray bursts. Studies (including those enabled by future generations of extremely large telescopes) of absorption by galaxies against the light of background galaxies will also benefit from our compilation.