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arXiv 1701.04847astro-ph.GAphysics.atom-ph
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与星际、环星系和星系间物质观测有关的跃迁的原子数据修正

Atomic Data Revisions for Transitions Relevant to Observations of Interstellar, Circumgalactic, and Intergalactic Matter

Frances H. Cashman, Varsha P. Kulkarni, Romas Kisielius, Gary J. Ferland, Pavel Bogdanovich

摘要:

天体物理光谱学对星系中元素丰度的测量敏感地依赖于所使用的原子数据。为了使最新的原子数据向社会开放,我们提出了一个汇编选定的原子数据的共振吸收线的波长longward的911.753(\ion{H}{1}莱曼极限),为关键的重元素(重于原子序数5)的天体物理学的兴趣。特别是,我们专注于已观察到的银河系星际介质(ISM),环星系介质(CGM)的银河系和/或其他星系,和星系际介质(IGM)的离子的过渡。我们提供波长、振荡器强度、相关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。约有22%的谱线更新了振子强度值,更新前后的振子强度值相差$\gtrsim$ ~0.1 dex。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暴的CGM和IGM研究的有用资源。对星系对背景星系光的吸收的研究(包括未来几代超大望远镜所能实现的研究)也将受益于我们的汇编。

英文摘要:

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 Å (the \ion{H}{1} 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 $\gtrsim$~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.

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