The Puzzling Properties of the MACS1149-JD1 Galaxy at z = 9.11

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/ad0159

Massimo Stiavelli, Takahiro Morishita, Marco Chiaberge, Claudio Grillo, Nicha Leethochawalit, Piero Rosati, Stefan Schuldt, Michele Trenti, Tommaso Treu

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Abstract

Abstract We analyze new JWST NIRCam and NIRSpec data on the redshift 9.11 galaxy MACS1149-JD1 (hereafter JD1). Our NIRCam imaging data reveal that JD1 comprises three spatially distinct components. Our spectroscopic data indicate that JD1 appears dust free but is already enriched, 12 + log ( O / H ) = 7.90 − 0.05 + 0.04 . We also find that the carbon and neon abundances in JD1 are below the solar abundance ratio. Particularly the carbon under-abundance is suggestive of recent star formation where Type II supernovae have already enriched the interstellar medium (ISM) in oxygen but intermediate mass stars have not yet enriched the ISM in carbon. A recent burst of star formation is also revealed by the star formation history derived from NIRCam photometry. Our data do not reveal the presence of a significant amount of old populations, resulting in a factor of ∼7× smaller stellar mass than previous estimates. Thus, our data support the view that JD1 is a young galaxy.

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z = 9.11时MACS1149-JD1星系令人费解的性质

摘要分析了JWST NIRCam和NIRSpec在红移9.11星系MACS1149-JD1(以下简称JD1)上的新数据。我们的NIRCam成像数据显示JD1由三个空间上不同的组件组成。我们的光谱数据表明JD1似乎没有尘埃，但已经富集，12 + log (O / H) = 7.90−0.05 + 0.04。我们还发现JD1中的碳和氖丰度低于太阳丰度比。特别是碳丰度不足暗示了最近的恒星形成，其中II型超新星已经丰富了星际介质(ISM)中的氧，但中等质量的恒星还没有丰富ISM中的碳。由NIRCam测光法得出的恒星形成历史也揭示了最近的恒星形成爆发。我们的数据并没有显示出大量老年人口的存在，导致恒星质量比以前的估计小7倍。因此，我们的数据支持JD1是一个年轻星系的观点。

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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.