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Determining the Relation between Dark and Luminous Matter: SDSS Weak Lensing Studies

确定暗物质和发光物质之间的关系：SDSS 弱透镜研究

基本信息

批准号：
0206277
负责人：
Timothy McKay
金额：
$ 33.48万
依托单位：
Regents of the University of Michigan - Ann Arbor
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2002
资助国家：
美国
起止时间：
2002-08-01 至 2006-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0206277&HistoricalAwards=false
关键词：
Determining Relation between Dark Luminous

项目摘要

AST-0206277McKay, Timothy A.Models of hierarchical structure formation based on N-body simulations now provide a relatively complete picture of the formation, evolution, and clustering properties of darkmatter halos around galaxies. Unfortunately, experimental determination of structure relies on observations of luminous galaxies, whose formation involves gas dynamics, star formation, and the feedback of entropy into the interstellar medium. These processes are complex, hampering direct simulation. As a result, the detailed relationship between luminous galaxies and their dark matter environments (the "bias") is poorly determined.This uncertainty seriously limits our ability to compare cosmological observations of galaxies to theoretical models. This program will conduct a closely coordinated observational and theoretical study of the relationship between luminous galaxies and their dark matter environments. McKay and his students will pursue weak lensing measurements within the Sloan Digital Sky Survey, while Evrard and Wechsler will make parallel measurements within N-body simulations. This will allow direct comparison of theory and observation at the level of the fundamental observables, without recourse to intermediate model fitting. By comparing lensing measurements to parallel studies of simulations this work will probe bias in new ways.***

AST-0206277 McKay，Timothy A.基于N体模拟的层次结构形成模型现在提供了星系周围暗物质晕形成，演化和聚集特性的相对完整的图片。不幸的是，结构的实验测定依赖于对发光星系的观测，其形成涉及气体动力学，星星形成，以及熵反馈到星际介质中。这些过程很复杂，妨碍了直接模拟。因此，我们很难确定亮星系和它们的暗物质环境之间的详细关系（“偏差”），这种不确定性严重限制了我们将星系的宇宙学观测与理论模型进行比较的能力。该计划将对发光星系及其暗物质环境之间的关系进行密切协调的观测和理论研究。McKay和他的学生将在斯隆数字巡天中进行弱透镜测量，而Evrard和Wechsler将在N体模拟中进行平行测量。这将允许直接比较理论和观测的基本观测量的水平，而不求助于中间模型拟合。通过将透镜测量与模拟的平行研究进行比较，这项工作将以新的方式探测偏差。