Discovery and properties of ultra-high redshift galaxies (9 < z < 12) in the JWST ERO SMACS 0723 Field
Discovery and properties of ultra-high redshift galaxies (9 < z < 12) in the JWST ERO SMACS 0723 Field
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DOI：
10.1093/mnras/stac3347
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发表时间：
2022-12-08
影响因子：
4.8
通讯作者：
Vijayan, A. P.
中科院分区：
文献类型：
--
作者：
Adams, N. J.;Conselice, C. J.;Vijayan, A. P.
我们提出了一个减少和分析的詹姆斯韦伯太空望远镜（JWST）SMACS 0723领域使用新的发射后校准进行搜索的超高红移星系（z > 9）的时代内的再电离。我们进行这种搜索建模测光红移在几种方式为所有的来源，并通过应用保守的幅度削减（m（F200 W）< 28），以确定强莱曼突破大于1马格。我们发现四个z > 9的候选星系，以前没有被确定，一个对象在z = 11.5，另一个可能是一个密切的星系对。我们从其他研究中测量候选星系的红移，发现恢复率只有23%，在我们的工作中，许多星系被分配了较低的红移，尘埃的解决方案。我们的大多数z > 9的样本都显示了巴耳末破裂的证据，或者来自H β和[O iii]的极端发射线，这表明恒星的年龄可能很大，或者非常年轻，这取决于F444W过量的原因。我们讨论了这些早期星系的解析结构，发现Sersic指数揭示了光浓度水平的混合，但我们所有系统的尺寸都非常小（
We present a reduction and analysis of the James Webb Space Telescope (JWST) SMACS 0723 field using new post-launch calibrations to conduct a search for ultra-high-redshift galaxies (z > 9) present within the Epoch of Reionization. We conduct this search by modelling photometric redshifts in several ways for all sources and by applying conservative magnitude cuts (m(F200W) < 28) to identify strong Lyman breaks greater than 1 mag. We find four z > 9 candidate galaxies which have not previously been identified, with one object at z = 11.5, and another which is possibly a close pair of galaxies. We measure redshifts for candidate galaxies from other studies and find the recovery rate to be only 23 per cent, with many being assigned lower redshift, dusty solutions in our work. Most of our z > 9 sample show evidence for Balmer-breaks, or extreme emission lines from H beta and [O iii], demonstrating that the stellar populations could be advanced in age or very young depending on the cause of the F444W excess. We discuss the resolved structures of these early galaxies and find that the Sersic indices reveal a mixture of light concentration levels, but that the sizes of all our systems are exceptionally small (