From Theory to the Sky: Observable Features of Clusters of Galaxies

从理论到天空：星系团的可观测特征

• 批准号: 0708150
• 负责人: August Evrard
• 金额: $ 30.5万
• 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: 2007
• 资助国家: 美国
• 起止时间: 2007-08-15 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0708150&HistoricalAwards=false
• 关键词: Theory; Sky; Observable; Features; Clusters

AST-0708150EvrardPowerful searches for galaxy clusters, the largest bound cosmic structures, are underway using pan-chromatic detection methods. These surveys can identify all of the most massive clusters in the Universe, which will then be mined for clues to dark energy. However, accurate conclusions require understanding the astrophysics that limits systematic uncertainties. This is a computational project to improve understanding of clusters as multi-component, dynamically active systems. State-of-the-art simulations with a range of astrophysical treatments will characterize how the intrinsic, visible content of clusters relates to total mass and epoch. Studying multiple characteristics simultaneously will provide the first estimates of covariance between important, independent measures, such as X-ray temperature and luminosity, optical richness, and total gas thermal energy. Mock sky maps will be used to test and improve cluster detection methods. The studies will be of general use for all cluster surveys, and will include measuring the statistical form of property covariance, understanding the causes and magnitudes of projected source confusion, and testing the effects of merger-driven transients.This project will train students in analysis involving data-intensive, high performance computing. The lead researcher continues to be active in organizing workshops and conferences, especially those that emphasize young researchers in the field, and intends a spring 2009 workshop to bring together observers, computational modelers and theorists to develop a consensus view of clusters as an astrophysical population, paving the way for dark energy studies.

AST-0708150Evrard 使用全色检测方法正在对星系团（最大的宇宙结构）进行强有力的搜索。 这些调查可以识别宇宙中所有最大的星团，然后将其挖掘以寻找暗能量的线索。 然而，准确的结论需要了解限制系统不确定性的天体物理学。 这是一个计算项目，旨在提高对集群作为多组件、动态活动系统的理解。 通过一系列天体物理处理进行的最先进的模拟将描述星团的内在可见内容如何与总质量和历元相关。 同时研究多个特征将首次估计重要的独立测量之间的协方差，例如 X 射线温度和光度、光学丰富度和总气体热能。 模拟天空图将用于测试和改进集群检测方法。 这些研究将普遍用于所有聚类调查，并将包括测量属性协方差的统计形式，了解预计源混乱的原因和程度，以及测试合并驱动瞬态的影响。该项目将培训学生进行涉及数据密集型、高性能计算的分析。 首席研究员继续积极组织研讨会和会议，特别是那些强调该领域年轻研究人员的研讨会和会议，并计划在 2009 年春季举办一次研讨会，将观察者、计算建模者和理论家聚集在一起，就星团作为天体物理学群体达成共识，为暗能量研究铺平道路。