Galaxy-Cluster Baryons and the Cooling-Flow Problem

星系团重子和冷却流问题

• 批准号: 0507399
• 负责人: Benjamin Chandran
• 金额: $ 17.56万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2005-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0507399&HistoricalAwards=false
• 关键词: Galaxy; Cluster; Baryons; Cooling; Flow

AST-0507399ChandranHeating of intra-cluster plasma holds the key to some of the central problems in the study of galaxy-cluster baryons, notably the 'cooling flow problem' and problems of cluster formation, and two of the most important heat sources are central active galactic nuclei (AGN) and thermal conduction. This project will carry out high-resolution two-fluid simulations of AGN-heated cluster cores, including correct treatment of cosmic-ray pressure and buoyancy, turbulent mixing, and thermal conduction, as well as test-particle simulations of electron diffusion in turbulent magnetic fields, to improve previous approximate theories of thermal conduction. The investigation will rigorously test whether AGN heating solves the cooling flow problem, and will also show how to modify cluster-formation simulations to account for these two important heating mechanisms. This will lead to a better understanding of the relation between cluster masses and observables, and assist cluster surveys to constrain cosmological parameters.The project includes junior researcher training, but also a major outreach effort through the University's Upward Bound Project, which targets low-income and first-generation students.

群集内等离子体的AST-0507399 Chandranheating构成研究中一些主要问题的关键，尤其是“冷却流问题”和簇形成的问题，而两个最重要的热源是中心的活性甲基分离核（AGN）和热式管道。 该项目将对AGN加热的集群核心进行高分辨率的两流体模拟，包括正确处理宇宙射线压力和浮力，湍流混合和热传导，以及对湍流磁场中电差扩散的测试粒子模拟，以改善先前的热传导的近似近似理论。 该研究将严格测试AGN加热是否解决了冷却流问题，还将展示如何修改聚类形成模拟以说明这两种重要的加热机制。 这将使人们更好地理解集群质量和可观察物之间的关系，并协助群集调查来限制宇宙学参数。该项目包括初级研究人员培训，但还通过大学的向上界项目进行了大量的外展工作，该项目针对低收入和第一代学生。