宇宙幼年：GOODS-S 与 GOODS-N 天区中 z > 8 的 JADES 星系候选体
The Cosmos in its Infancy: JADES Galaxy Candidates at z > 8 in GOODS-S and GOODS-N
AI总结：
本文基于 JADES 深度 NIRCam 成像在 GOODS-S 和 GOODS-N 天区构建了 717 个 z > 8 的星系候选体星表，结合多波段测光与光谱验证，为研究宇宙早期星系形成提供了高可靠样本。
摘要：
我们呈现了一个包含 717 个 z > 8 候选星系的星表，这些候选体选自 125 平方角分的 NIRCam 成像数据，属于 JWST 先进深场河外巡天（JADES）的一部分。我们将完整的 JADES 成像数据集与 JEMS 和 FRESCO 两个 JWST 巡天项目的数据，以及 HST/ACS 已有的极深观测数据相结合，最终滤光片组合包括十五个 JWST/NIRCam 滤光片和五个 HST/ACS 滤光片。高红移星系候选体通过模板拟合方法估算的测光红移进行初选，随后由七位独立评审员进行目视检查。我们详细研究了这些候选体，重点展示了有趣的解析源或延展源、长波长斜率非常红的天体，以及我们红移最高的候选体，其测光红移最高可达 z_phot = 18。我们还调查了恒星天体可能造成的污染，通过 SED 拟合未发现有力证据表明这些暗弱的高红移星系候选体是低质量恒星。超过 93% 的天体是由我们的深度 JADES 成像新发现的，其中包括 31 个 z_phot > 12 的新星系候选体。利用样本中 42 个具有 NIRSpec 和 FRESCO 光谱红移测量的天体，我们发现测光红移估计与光谱红移高度一致，没有灾难性离群值，平均差异为 ⟨Δz = z_phot − z_spec⟩ = 0.26。这些天体构成了探测宇宙历史最初几亿年内星系早期增长的最可靠样本之一。
英文摘要：
We present a catalog of 717 candidate galaxies at $z > 8$ selected from 125 square arcminutes of NIRCam imaging as part of the JWST Advanced Deep Extragalactic Survey (JADES). We combine the full JADES imaging dataset with data from the JEMS and FRESCO JWST surveys along with extremely deep existing observations from HST/ACS for a final filter set that includes fifteen JWST/NIRCam filters and five HST/ACS filters. The high-redshift galaxy candidates were selected from their estimated photometric redshifts calculated using a template fitting approach, followed by visual inspection from seven independent reviewers. We explore these candidates in detail, highlighting interesting resolved or extended sources, sources with very red long-wavelength slopes, and our highest redshift candidates, which extend to $z_{phot} = 18$. We also investigate potential contamination by stellar objects, and do not find strong evidence from SED fitting that these faint high-redshift galaxy candidates are low-mass stars. Over 93\% of the sources are newly identified from our deep JADES imaging, including 31 new galaxy candidates at $z_{phot} > 12$. Using 42 sources in our sample with measured spectroscopic redshifts from NIRSpec and FRESCO, we find excellent agreement to our photometric redshift estimates, with no catastrophic outliers and an average difference of $\langle Δz = z_{phot}- z_{spec} \rangle= 0.26$. These sources comprise one of the most robust samples for probing the early buildup of galaxies within the first few hundred million years of the Universe's history.
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