Collaborative Research: Voids and Void Galaxies

这是与普林斯顿大学岑仁月合作的研究项目(AST0071153)。这项研究的目标是建立空洞及其组成星系的详细模型(使用自适应网格优化代码，允许比以前的模型更精细的空间分辨率)，并将这些模型与斯隆数字天空调查(SDSS)的数据进行比较。然后，这些比较将被用来对不同的宇宙学模型、空洞的结构和动力学设置约束，并研究星系如何在低密度环境中形成和演化。研究人员建议研究宇宙中密度最低的区域(称为空洞)。空洞在宇宙大尺度结构演化和星系形成过程中起着至关重要的作用，但人们对空洞的认识和研究还很少。提出者将对空洞形成进行理论计算机模拟，并将这些模型与斯隆数字巡天获得的星系密度和空间分布的观测结果进行比较，以检验这些模型。由于这些计算机模型都将依赖于不同类型宇宙学的不同输入参数，因此比较将有助于识别哪些宇宙学模型是正确的。该项目的资金由NSF河外天文与宇宙学计划(AST/EXC)提供。*

ABSTRACTVogeleyAST-0071201This is a collaborative research project with Renyue Cen at Princeton University (AST0071153). The goal of this research is to construct detailed models (using an Adaptive Mesh Refinement code which allows for finer spatial resolution than previous models) of voids and their constituent galaxies and compare these models with data from the Sloan Digital Sky Survey (SDSS). These comparisons will then be used to set constraints on different cosmological models, the structure and dynamics of voids, and to investigate how galaxies form and evolve in a low density environment. The investigators propose to study the lowest density regions of the universe (called Voids). Voids play a critical role in the evolution of large scale structure and galaxy formation in the universe, yet they are poorly understood and poorly studied.The proposors will conduct theoretical computer modeling of void formation and test these models by comparing them with observations of galaxy densities and spatial distributions obtained from the Sloan Digital Sky Survey. Since these computer models will each depend on input parameters which are different for different types of cosmology, the comparison will help identify which cosmological models are correct. Funding for this project was provided by the NSF program for Extragalactic Astronomy & Cosmology (AST/EXC).***