Understanding Galaxy Evolution Through Emission Lines

IF 26.3 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Annual Review of Astronomy and Astrophysics Pub Date : 2019-08-18 DOI:10.1146/annurev-astro-081817-051832
L. Kewley, D. Nicholls, R. Sutherland
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引用次数: 162

Abstract

We review the use of emission lines for understanding galaxy evolution, focusing on excitation source, metallicity, ionization parameter, ISM pressure, and electron density. We discuss the physics, benefits, and caveats of emission line diagnostics, including the effects of theoretical model uncertainties, diffuse ionized gas, and sample selection bias. In anticipation of upcoming telescope facilities, we provide new self-consistent emission line diagnostic calibrations for complete spectral coverage from the UV to the IR. These diagnostics can be used in concert to understand how fundamental galaxy properties have changed across cosmic time. We conclude the following: ▪ The UV, optical, and IR contain complementary diagnostics that can probe the conditions within different nebular ionization zones. ▪ Accounting for complex density gradients and temperature profiles is critical for reliably estimating the fundamental properties of Hii regions and galaxies. ▪ Diffuse ionized gas can raise metallicity estimates, flatten metallicity gradients, and introduce scatter in ionization parameter measurements. ▪ New 3D emission line diagnostics successfully separate the contributions from star formation, AGN, and shocks using integral field spectroscopy. We summarize with a discussion of the challenges and major opportunities for emission line diagnostics in the coming years.
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通过发射线了解星系演化
我们回顾了使用发射线来理解星系演化,重点是激发源、金属性、电离参数、ISM压力和电子密度。我们讨论了发射线诊断的物理学、优点和注意事项,包括理论模型不确定性、扩散电离气体和样品选择偏差的影响。在即将到来的望远镜设施的预期中,我们提供了新的自洽发射线诊断校准,以实现从紫外线到红外线的完整光谱覆盖。这些诊断可以协同使用,以了解星系的基本性质如何在宇宙时间内发生变化。我们得出以下结论:▪ 紫外线、光学和红外包含互补诊断,可以探测不同星云电离区内的情况。▪ 考虑复杂的密度梯度和温度分布对于可靠地估计Hii区域和星系的基本性质至关重要。▪ 扩散电离气体可以提高金属度估计,使金属度梯度变平,并在电离参数测量中引入散射。▪ 新的3D发射线诊断使用积分场光谱学成功地分离了恒星形成、AGN和冲击的贡献。我们总结了未来几年排放线诊断的挑战和主要机遇。
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来源期刊
Annual Review of Astronomy and Astrophysics
Annual Review of Astronomy and Astrophysics 地学天文-天文与天体物理
CiteScore
54.80
自引率
0.60%
发文量
14
期刊介绍: The Annual Review of Astronomy and Astrophysics is covers significant developments in the field of astronomy and astrophysics including:The Sun,Solar system and extrasolar planets,Stars,Interstellar medium,Galaxy and galaxies,Active galactic nuclei,Cosmology,Instrumentation and techniques, History of the development of new areas of research.
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