arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2407.14973astro-ph.GAastro-ph.CO
收藏

EPOCHS I. 在再电离纪元 $6.5 < z < 18$ 处利用 PEARLS 和公开 JWST 数据发现星系及其恒星形成性质

EPOCHS I. The Discovery and Star Forming Properties of Galaxies in the Epoch of Reionization at $6.5 < z < 18$ with PEARLS and Public JWST data

Christopher J. Conselice, Nathan Adams, Thomas Harvey, Duncan Austin, Leonardo Ferreira, Katherine Ormerod, Qiao Duan, James Trussler, Qiong Li, Ignas Juodzbali… 展开作者

Christopher J. Conselice, Nathan Adams, Thomas Harvey, Duncan Austin, Leonardo Ferreira, Katherine Ormerod, Qiao Duan, James Trussler, Qiong Li, Ignas Juodzbalis, Lewi Westcott, Honor Harris, Louise T. C. Seeyave, Asa F. L. Bluck, Rogier A. Windhorst, Rachana Bhatawdekar, Dan Coe, Seth H. Cohen, Cheng Cheng, Simon P. Driver, Brenda Frye, Lukas J. Furtak, Norman A. Grogin, Nimish P. Hathi, Benne W. Holwerda, Rolf A. Jansen, Anton M. Koekemoer, Madeline A. Marshall, Mario Nonino, Aaron Robotham, Jake Summers, Stephen M. Wilkins, Christopher N. A. Willmer, Haojing Yan, Adi Zitrin

AI总结:

本文利用 PEARLS 和公开 JWST 数据发现 1165 个高红移星系($6.5<z<18$),通过严谨方法识别并分析其性质,发现恒星质量驱动星系形成,且在 $z>12$ 处存在星系数量超出模型预测的张力。

摘要:

本文介绍了在 JWST NIRCam 深场成像中发现的 1165 个高红移($6.5 < z < 18$)星系的发现、性质及星表,这些成像来自 GTO PEARLS 巡天并结合了 JWST 公开场的数据。我们描述了我们定制的均匀数据处理流程,以及对这些区域的分析,包括 NEP、CEERS、GLASS、NGDEEP、JADES 和 ERO SMACS-0723 场,总成像面积超过 214 平方角分,深度达到约 30 星等。我们描述了识别这些星系的严谨方法,包括使用莱曼断裂强度、探测显著性标准、目视检查以及主要集中于高红移的集成测光红移概率分布。我们的样本是一个稳健且高纯度的遥远星系集合,我们还从中去除了褐矮星,并通过模拟计算了完备性和污染率。我们总结了这些 $z > 6.5$ 星系的基本性质,包括其红移分布、紫外绝对星等和恒星形成率。我们对这些年轻星系的研究揭示了广泛的恒星种群性质,如其颜色和 SED 拟合所示,我们将其与恒星种群模型进行比较,表明存在多种恒星形成历史、尘埃、活动星系核和/或星云发射。我们发现恒星质量与 $(U-V)$ 颜色之间存在强趋势,并且早在 $z \sim 12$ 时就存在恒星形成的“主序”。这表明恒星质量,或与恒星质量相关的潜在变量,正在驱动星系形成,这与模拟预测一致。我们还在样本中发现了 $z > 12$ 的超高红移候选体,并描述了它们的性质。最后,我们注意到在 $z > 12$ 处观测到的星系数量显著超过模型预测,揭示了预测与观测之间的紧张关系。

英文摘要:

We present in this paper the discovery, properties, and a catalog of 1165 high redshift $6.5 < z < 18$ galaxies found in deep JWST NIRCam imaging from the GTO PEARLS survey combined with data from JWST public fields. We describe our bespoke homogeneous reduction process and our analysis of these areas including the NEP, CEERS, GLASS, NGDEEP, JADES, and ERO SMACS-0723 fields with over 214 arcmin$^{2}$ imaged to depths of $\sim 30$ mag. We describe our rigorous methods for identifying these galaxies, involving the use of Lyman-break strength, detection significance criteria, visual inspection, and integrated photometric redshifts probability distributions predominately at high redshift. Our sample is a robust and highly pure collection of distant galaxies from which we also remove brown dwarf stars, and calculate completeness and contamination from simulations. We include a summary of the basic properties of these $z > 6.5$ galaxies, including their redshift distributions, UV absolute magnitudes, and star formation rates. Our study of these young galaxies reveals a wide range of stellar population properties as seen in their colors and SED fits which we compare to stellar population models, indicating a range of star formation histories, dust, AGN and/or nebular emission. We find a strong trend exists between stellar mass and $(U-V)$ color, as well as the existence of the `main-sequence' of star formation for galaxies as early as $z \sim 12$. This indicates that stellar mass, or an underlying variable correlating with stellar mass, is driving galaxy formation, in agreement with simulation predictions. We also discover ultra-high redshift candidates at $z > 12$ in our sample and describe their properties. Finally, we note a significant observed excess of galaxies compared to models at $z > 12$, revealing a tension between predictions and our observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑