Multiobject Spectroscopy of Galaxy Clusters at z ∼ 0.95 in the Ultra Deep Survey Field with Different Star Formation Properties and Large-scale Environments

The Astrophysical Journal Supplement Series Pub Date : 2024-06-01 DOI:10.3847/1538-4365/ad45f8

Seong-Kook Lee, Myungshin Im, Bomi Park, M. Hyun, I. Paek, Dohyeong Kim

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Abstract

While galaxy clusters are dominated by quiescent galaxies in the local Universe, they show a wide range in quiescent galaxy fraction (QF) at higher redshifts. Here we present the discovery of two galaxy clusters at z ∼ 0.95 with contrasting QFs despite having similar masses (log (M 200/M ⊙) ∼ 14) and spectra and redshifts of 29 galaxies in these clusters and 76 galaxies in the surrounding area. The clusters are found in the Ultra Deep Survey field and confirmed through multiobject spectroscopic observation using the Inamori Magellan Areal Camera and Spectrograph on the Magellan telescope. The two clusters exhibit QFs of 0.094−0.032+0.11 and 0.38−0.11+0.14 , respectively. Analysis of large-scale structures (LSSs) surrounding these clusters finds that properties of these clusters are consistent with the anticorrelation trend between the QF and the extent of surrounding LSS, found in Lee et al., which can be interpreted as a result of the replenishment of young, star-forming galaxies keeping the QF low when galaxy clusters are accompanied by rich surrounding environments.

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对超深巡天观测场中 z ∼ 0.95 星级、具有不同恒星形成特性和大尺度环境的星系团进行多目标光谱分析

在本宇宙中，星系团主要由静止星系组成，但在较高的红移下，它们的静止星系比例（QF）却有很大的差异。在这里，我们发现了两个z ∼ 0.95的星系团，尽管它们的质量（log (M 200/M ⊙) ∼ 14）、光谱和红移都很相似，但它们的静止星系比例却截然不同，这两个星系团中有29个星系，周围区域有76个星系。这些星系团是在超深空巡天领域中发现的，并通过使用麦哲伦望远镜上的稻盛麦哲伦区域照相机和摄谱仪进行多目标光谱观测而得到确认。这两个星团的 QF 分别为 0.094-0.032+0.11 和 0.38-0.11+0.14 。对这些星团周围大尺度结构（LSS）的分析发现，这些星团的性质与Lee等人发现的QF与周围LSS范围之间的反相关趋势一致，这可以解释为当星系团周围环境丰富时，年轻恒星形成星系的补充使QF保持在较低水平。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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The Astrophysical Journal Supplement Series

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