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    • Euclid Preparation. Exploring the Properties of Proto-Clusters in the Simulated Euclid Wide Survey

    Astronomy &amp Astrophysics（2024）

    Cited 1|Views5
    Abstract
    Galaxy proto-clusters are receiving an increased interest since most of the processes shaping the structure of clusters of galaxies and their galaxy population are happening at early stages of their formation. The Euclid Survey will provide a unique opportunity to discover a large number of proto-clusters over a large fraction of the sky (14 500 square degrees). In this paper, we explore the expected observational properties of proto-clusters in the Euclid Wide Survey by means of theoretical models and simulations. We provide an overview of the predicted proto-cluster extent, galaxy density profiles, mass-richness relations, abundance, and sky-filling as a function of redshift. Useful analytical approximations for the functions of these properties are provided. The focus is on the redshift range z= 1.5 to 4. We discuss in particular the density contrast with which proto-clusters can be observed against the background in the galaxy distribution if photometric galaxy redshifts are used as supplied by the ESA Euclid mission together with the ground-based photometric surveys. We show that the obtainable detection significance is sufficient to find large numbers of interesting proto-cluster candidates. For quantitative studies, additional spectroscopic follow-up is required to confirm the proto-clusters and establish their richness.
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    Chat Paper
    【要点】：本文通过理论模型和模拟，探讨了Euclid广域巡天中预期的原星系团观测特性，并预测了其在不同红移下的范围、星系密度分布、质量-丰富度关系、丰富度及天空覆盖率。
    

    【方法】：作者使用理论模型和模拟方法，分析了Euclid广域巡天中原星系团的观测特性。
    

    【实验】：研究基于Euclid广域巡天模拟数据，预测了原星系团在不同红移下的观测属性，并通过ESA Euclid任务提供的测光星系红移以及地面测光巡天数据，讨论了原星系团在星系分布背景下的密度对比度。结果表明，可获得的探测显著性足以发现大量有意义的原星系团候选体。对于定量研究，需要额外的光谱学后续观测来确认原星系团并确定其丰富度。
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