揭秘:照亮早期宇宙——jwst /NIRSpec对z >12个星系

IF 8.8 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Astrophysical Journal Letters Pub Date : 2023-11-01 DOI:10.3847/2041-8213/acfe07

Bingjie 冰洁 Wang 王, Seiji Fujimoto, Ivo Labbé, Lukas J. Furtak, Tim B. Miller, David J. Setton, Adi Zitrin, Hakim Atek, Rachel Bezanson, Gabriel Brammer, Joel Leja, Pascal A. Oesch, Sedona H. Price, Iryna Chemerynska, Sam E. Cutler, Pratika Dayal, Pieter van Dokkum, Andy D. Goulding, Jenny E. Greene, Y. Fudamoto, Gourav Khullar, Vasily Kokorev, Danilo Marchesini, Richard Pan, John R. Weaver, Katherine E. Whitaker, Christina C. Williams

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引用次数: 0

摘要

高红移星系的观测为早期星系形成理论提供了一个关键的直接测试，但迄今为止，只有三个在z >12. 由于大面积的强引力透镜效应，A2744星系团场是寻找最早星系的理想场所。在这里，我们展示了JWST/NIRSpec对两个星系的观测结果:一个在z spec = 12.393−0.001 + 0.004的可靠探测，以及一个在z spec = 13.079−0.001 + 0.013的可信候选星系。这些星系是在JWST/NIRCam成像中发现的，它们的距离是通过JWST/NIRSpec光谱推断出来的，所有这些都来自JWST Cycle 1 reveal国库调查。使用JWST NIRCam和NIRSpec数据的详细恒星人口模型证实了这些星系的原始特征:低质量(~ 10 8 M⊙)、年轻、快速聚集、金属贫乏和恒星形成。有趣的是，这两个星系都是空间分辨的，透镜校正后的静紫外有效半径在300 - 400pc左右，明显大于其他经光谱确认的类似红移的星系。观测到的z > 10大小的动态范围跨越了1个数量级，这意味着在早期的尺寸-质量关系中存在明显的分散。在再电离时代的深处，这些发现阐明了第一批星系的出现。

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UNCOVER: Illuminating the Early Universe—JWST/NIRSpec Confirmation of z > 12 Galaxies

Abstract Observations of high-redshift galaxies provide a critical direct test to the theories of early galaxy formation, yet to date, only three have been spectroscopically confirmed at z > 12. Due to strong gravitational lensing over a wide area, the galaxy cluster field A2744 is ideal for searching for the earliest galaxies. Here we present JWST/NIRSpec observations of two galaxies: a robust detection at z spec = 12.393 − 0.001 + 0.004 , and a plausible candidate at z spec = 13.079 − 0.001 + 0.013 . The galaxies are discovered in JWST/NIRCam imaging and their distances are inferred with JWST/NIRSpec spectroscopy, all from the JWST Cycle 1 UNCOVER Treasury survey. Detailed stellar population modeling using JWST NIRCam and NIRSpec data corroborates the primeval characteristics of these galaxies: low mass (∼10 8 M ⊙ ), young, rapidly assembling, metal-poor, and star-forming. Interestingly, both galaxies are spatially resolved, having lensing-corrected rest-UV effective radii on the order of 300–400 pc, which are notably larger than other spectroscopically confirmed systems at similar redshifts. The observed dynamic range of z ≳ 10 sizes spans over 1 order of magnitude, implying a significant scatter in the size–mass relation at early times. Deep into the epoch of reionization, these discoveries elucidate the emergence of the first galaxies.

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来源期刊

Astrophysical Journal Letters ASTRONOMY & ASTROPHYSICS-

CiteScore

14.10

自引率

6.30%

发文量

513

审稿时长

2-3 weeks

期刊介绍： The Astrophysical Journal Letters (ApJL) is widely regarded as the foremost journal for swiftly disseminating groundbreaking astronomical research. It focuses on concise reports that highlight pivotal advancements in the field of astrophysics. By prioritizing timeliness and the generation of immediate interest among researchers, ApJL showcases articles featuring novel discoveries and critical findings that have a profound effect on the scientific community. Moreover, ApJL ensures that published articles are comprehensive in their scope, presenting context that can be readily comprehensible to scientists who may not possess expertise in the specific disciplines covered.