JADES：利用莱曼-阿尔法发射测量再电离特性

arXiv - PHYS - Astrophysics of Galaxies Pub Date : 2024-09-10 DOI:arxiv-2409.06405

Gareth C. Jones, Andrew J. Bunker, Aayush Saxena, Santiago Arribas, Rachana Bhatawdekar, Kristan Boyett, Stefano Carniani, Stephane Charlot, Emma Curtis-Lake, Kevin Hainline, Benjamin D. Johnson, Nimisha Kumari, Michael V. Maseda, Hans-Walter Rix, Brant E. Robertson, Sandro Tacchella, Hannah Übler, Christina C. Williams, Chris Willott, Joris Witstok, Yongda Zhu

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引用次数: 0

摘要

Ly$\alpha$ 是氢（最常见的元素）从第一激发态向基态的转变。中性氢对这条线的共振散射极大地阻碍了它从星系中出现，因此显示出Ly$\alpha$的星系比例是星系间介质（IGM）中性部分的示踪剂，从而也是再电离历史的示踪剂。在以前的工作中，我们利用JWST高级深河外星系巡天（JADES）的早期JWST/NIRSpec数据对Ly$\alpha$发射星系（LAEs）进行了分类和定性。这项巡天现在已接近尾声，目前的样本几乎大了一个数量级。我们再现了之前发现的Ly$alpha$逸散分数（\fesc）- Ly$alpha$静帧等效宽度（\rew）之间的相关性，以及Ly$alpha$速度偏移-\fesc之间的负相关性。fesc和rew都随着红移（$z\gtrsim5.5$）的减小而减小，表明在种群尺度上电离的进展。我们的数据被用来证明从$z\sim14-6$开始，Ly$\alpha$的IGM传输在不断增加。我们测量了从$z=4-9.5$的LAEs的完整性校正分数（$X_{Ly\alpha}$）。将这些$X_{Ly\alpha}$值应用到宇宙学模型的结果表明，在$z=7$时，中性分率很高（$\rmX_{HI}=0.81_{-0.10}^{+0.07}$），这很可能表明需要使用更新的（基于与其他工作的比较）\rew分布的模型。这个大样本的LAEs和我们详细介绍的完整性校正，将有助于对EoR中的星系进行无偏的种群研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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JADES: Measuring reionization properties using Lyman-alpha emission

Ly$\alpha$ is the transition to the ground state from the first excited state of hydrogen (the most common element). Resonant scattering of this line by neutral hydrogen greatly impedes its emergence from galaxies, so the fraction of galaxies which show Ly$\alpha$ is a tracer of the neutral fraction of the intergalactic medium (IGM), and thus the history of reionization. In previous works, we used early JWST/NIRSpec data from the JWST Advanced Deep Extragalactic Survey (JADES) to classify and characterise Ly$\alpha$ emitting galaxies (LAEs). This survey is now approaching completion, and the current sample is nearly an order of magnitude larger. From a sample of 784 galaxies in JADES at $4.0

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arXiv - PHYS - Astrophysics of Galaxies

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