arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.6633astro-ph.CO
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宇宙的大尺度结构

Large Scale Structure of the Universe

Alison L. Coil

摘要:

银河系在空间中不是均匀分布的。在大尺度上,宇宙显示出相干结构,星系以~1-3 Mpc/h的尺度存在于星系群和星系团中,它们位于长度>10 Mpc/h的星系长纤维的交叉点。相对空旷的空间的巨大区域,被称为空洞,包含很少的星系,并跨越这些结构之间的体积。这种观测到的大尺度结构既依赖于宇宙学参数,也依赖于星系的形成和演化。利用两点关联函数,可以追踪星系的大尺度结构对光度、颜色、质量等性质的依赖关系,并追踪其随红移的演化。比较观测到的星系集群签名与暗物质模拟允许一个模型和理解的星系集群和它们的形成和演化的父暗物质晕。聚类测量可以确定给定星系群的母暗物质晕质量,连接不同时期观察到的星系群,并约束宇宙学参数和星系演化模型。本章介绍了用于测量两点关联函数在红移和实空间的方法,提出了目前的结果,如何集群振幅取决于各种星系的属性,并讨论了定量测量的空洞和细丝的结构。这些结果与当前的理论模型的解释。

英文摘要:

Galaxies are not uniformly distributed in space. On large scales the Universe displays coherent structure, with galaxies residing in groups and clusters on scales of ~1-3 Mpc/h, which lie at the intersections of long filaments of galaxies that are >10 Mpc/h in length. Vast regions of relatively empty space, known as voids, contain very few galaxies and span the volume in between these structures. This observed large scale structure depends both on cosmological parameters and on the formation and evolution of galaxies. Using the two-point correlation function, one can trace the dependence of large scale structure on galaxy properties such as luminosity, color, stellar mass, and track its evolution with redshift. Comparison of the observed galaxy clustering signatures with dark matter simulations allows one to model and understand the clustering of galaxies and their formation and evolution within their parent dark matter halos. Clustering measurements can determine the parent dark matter halo mass of a given galaxy population, connect observed galaxy populations at different epochs, and constrain cosmological parameters and galaxy evolution models. This chapter describes the methods used to measure the two-point correlation function in both redshift and real space, presents the current results of how the clustering amplitude depends on various galaxy properties, and discusses quantitative measurements of the structures of voids and filaments. The interpretation of these results with current theoretical models is also presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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