最初十亿年内超大质量星系的加速形成
星系天体物理
2024-09-23 v2
摘要
近期的 JWST 观测揭示了早期宇宙中数量出乎意料的大质量星系候选体，其红移延伸更远、光度低于此前亚毫米巡天所发现者。这些 JWST 候选体被解释为对 CDM 宇宙学的挑战，但迄今主要仅依赖静止系紫外数据，且缺乏红移的光谱确认。在此我们报道对来自 JWST FRESCO 巡天的 36 个具有 光谱红移的大质量尘埃遮蔽星系的系统研究。我们发现样本与 CDM 模型无张力。然而，三个超大质量星系（log ）需要高达 50% 的重子转化为恒星的异常比例——比即便后期最高效的星系也要高出两到三倍。活动星系核的贡献不太可能，因其延展发射。超大质量星系在 时占总宇宙恒星形成率密度的比例高达 17%。
引用
@article{arxiv.2309.02492,
title = {Accelerated Formation of Ultra-Massive Galaxies in the First Billion Years},
author = {Mengyuan Xiao and Pascal Oesch and David Elbaz and Longji Bing and Erica Nelson and Andrea Weibel and Garth Illingworth and Pieter van Dokkum and Rohan Naidu and Emanuele Daddi and Rychard Bouwens and Jorryt Matthee and Stijn Wuyts and John Chisholm and Gabriel Brammer and Mark Dickinson and Benjamin Magnelli and Lucas Leroy and Daniel Schaerer and Thomas Herard-Demanche and Seunghwan Lim and Laia Barrufet and Ryan Endsley and Yoshinobu Fudamoto and Carlos Gómez-Guijarro and Rashmi Gottumukkala and Ivo Labbe and Daniel Magee and Danilo Marchesini and Michael Maseda and Yuxiang Qin and Naveen Reddy and Alice Shapley and Irene Shivaei and Marko Shuntov and Mauro Stefanon and Katherine Whitaker and J. Stuart Wyithe},
journal= {arXiv preprint arXiv:2309.02492},
year = {2024}
}
备注
Nature in press. Updated to the accepted version. 24 pages, 4 main figures, 7 supplementary figures, 3 supplementary tables