宇宙黎明时刻捕获的原始大质量恒星形成
宇宙学与河外天体物理
2025-08-01 v2
摘要
拥有无重元素星系是宇宙学模型的关键预测。迄今为止，尚未确认任何“零金属”或第三型星系。本文报告了在红移 z = 5.725 时（称为“AMORE6”）发现的极金属贫瘦星系，该星系被前景星系簇放大成像。JWST 光谱在两个位置一致检测到 Hβ，但 [OIII] λλ4960,5008 仍未被检测到。这将其氧元素丰度置于不超过日金属值的 0.12%（置信区间为 2σ），使其成为目前已知最原始的天体。AMORE6 具有异常特性，表明其正在进行原始大质量恒星形成。此类天体在相对晚的宇宙时代被发现令人惊讶，但也印证了大爆炸模型的基本理念。
引用
@article{arxiv.2507.10521,
title = {Pristine Massive Star Formation Caught at the Break of Cosmic Dawn},
author = {Takahiro Morishita and Zhaoran Liu and Massimo Stiavelli and Tommaso Treu and Pietro Bergamini and Yechi Zhang},
journal= {arXiv preprint arXiv:2507.10521},
year = {2025}
}
备注
Updated after addressing some comments. A new figure S6 was added showing Lya and Hb lines; Fig.3 was updated to reflect the updated Oxygen abundance measurement (12+log (O/H) < 5.8, at 2sigma); update to the physical size of the source; Hb EW0 measurement is quoted. None of the main conclusions changed