从 DESI 遗留成像巡天中发现的 158 万个星系团目录

Z. L. Wen, J. L. Han
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引用次数: 0

摘要

基于DESI遗留成像巡天发布的数据和现有的光谱红移,我们通过搜索预选大质量星系周围红移切片内星系恒星质量分布的过密度,识别出158万个星系团,其中877806个星系团是首次发现。确定的星团等效质量为 M500 ≥ 0.47 × 1014M⊙,不确定度为 0.2 dex。星团的红移分布延伸到 z ∼ 1.5,338,841 个星团具有光谱红移。我们的星团样本包括了以前星表中大部分丰富的光学星团,95%以上的大质量苏尼亚耶夫-泽尔多维奇星团,以及90%的ROSAT和eROSITA X射线星团。根据成员星系的光分布,我们推导出了27,685个富集星团的动力学状态参数,发现动力学状态并没有随红移发生显著的演变。我们发现自 z = 1 起,最亮星团星系的恒星质量增长了 2 倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Catalog of 1.58 Million Clusters of Galaxies Identified from the DESI Legacy Imaging Surveys
Based on the DESI Legacy Imaging Surveys released data and available spectroscopic redshifts, we identify 1.58 million clusters of galaxies by searching for the overdensity of the stellar mass distribution of galaxies within redshift slices around preselected massive galaxies, with 877,806 clusters being found for the first time. The identified clusters have an equivalent mass of M 500 ≥ 0.47 × 1014 M with an uncertainty of 0.2 dex. The redshift distribution of clusters extends to z ∼ 1.5, and 338,841 clusters have spectroscopic redshifts. Our cluster sample includes most of the rich optical clusters in previous catalogs, more than 95% of the massive Sunyaev–Zeldovich clusters, and 90% of the ROSAT and eROSITA X-ray clusters. From the light distributions of the member galaxies, we derive the dynamical state parameters for 27,685 rich clusters and find no significant evolution of the dynamical state with redshift. We find that the stellar mass of the brightest cluster galaxies grows by a factor of 2 since z = 1.
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