The abundance of z ? 10 galaxy candidates in the HUDF using deep JWST NIRCam medium-band imaging
The abundance of z ? 10 galaxy candidates in the HUDF using deep JWST NIRCam medium-band imaging
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z 的丰度？
DOI：
10.1093/mnras/stad471
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发表时间：
2023
影响因子：
4.8
通讯作者：
Donnan C
中科院分区：
文献类型：
--
作者：
Donnan C
我们利用JWST近红外相机中波段成像在哈勃超深场（HUDF）和由第二个近红外相机模块提供的GOODS-South场中的额外指向中搜索极端红移（z≥ 9.5）星系候选者。我们的搜索揭示了六个强有力的候选者，其中三个最近已经被光谱证实。这三个星系之一是之前有争议的zphot 12星系候选者UDF-22980，它现在被五个JWST NIRCam中带滤波器（F182 M，F210 M，F430 M，F460 M和F480 M）检测到，有效地排除了其他低红移的解决方案，并允许我们现在报告一个安全的光度红移zphot = 11.6 ± 0.2。我们还发现了两个星系atz≥ 12.5，其中包括一个新发现的候选星系，这是由第二个NIRCam模块（HUDF西南）atzphot= 12.6 ± 0.6提供的图像。我们用风笛拟合14波段光度计，确定了这6个星系的物理性质。我们发现恒星质量log（M/M）为<$7.5 −8.7，恒星形成速率为。尽管HUDF本身和第二个NIRCam模块成像所覆盖的宇宙体积相对较小，但我们发现这些星系的存在与紫外光度函数和宇宙恒星形成率密度的最新测量结果完全一致，支持宇宙恒星形成率密度逐渐稳定下降到至少15。
We utilize JWST NIRCam medium-band imaging to search for extreme redshift (z≥ 9.5) galaxy candidates in the Hubble ultra deep field (HUDF) and the additional pointing within the GOODS-South field provided by the second NIRCam module. Our search reveals six robust candidates, three of which have recently been spectroscopically confirmed. One of these three is the previously controversialz≃ 12 galaxy candidate UDF-22980 which is now detected in five JWST NIRCam medium-band filters (F182M, F210M, F430M, F460M, and F480M), efficiently excluding alternative low-redshift solutions and allowing us to now report a secure photometric redshift ofzphot= 11.6 ± 0.2. We also detect two galaxies atz≥ 12.5 including a newly-detected candidate in the imaging provided by the second NIRCam module (south-west of the HUDF) atzphot= 12.6 ± 0.6. We determine the physical properties of the six galaxies by fitting the 14-band photometry withBagpipes. We find stellar masses of log (M⋆/M⊙) ≃ 7.5−8.7 and star-formation rates of. Despite the relatively small cosmological volume covered by the HUDF itself and the second NIRCam module imaging, we find that the existence of these galaxies is fully consistent with the latest measurements of both the ultraviolet luminosity function and cosmic star-formation rate density atz≃ 11, supporting a gradual steady decline in the cosmic star-formation rate density out to at leastz≃ 15.