Feedback from the First Stars

来自第一批明星的反馈

• 批准号: 0606959
• 负责人: Greg Bryan
• 金额: $ 20.96万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-01 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0606959&HistoricalAwards=false
• 关键词: Feedback; First; Stars

The Principal Investigator and his collaborators will carry out a combined program aimed at modeling the first generation of baryonic objects. The first step is adaptive-mesh refinement simulations, a popular method that adjusts the simulation box sizes to reflect the density of matter. The work self-consistently includes essential physical effects, such as the ultra-violet background radiation field and the production of metals and energy via supernovae. The results will enable us to gain a physical understanding of how these processes will affect the next generation, and to calibrate simple analytic prescriptions. In the second step, they will combine this quantitative and qualitative understanding with semi-analytic models of structure formation and reionization in order to make a wide range of observational predictions for the next generation of ground and space-based observatories.A graduate student will carry out the proposed work in the form of PhD thesis research. The simulations will serve as the basis for high-quality visualizations in conjunction with personnel at the National Center for Supercomputing Applications and the American Museum of Natural History with whom both members of the team have worked previously. Another initiative will involve New York high school teachers and students with the Science Research Training Program.

首席研究员和他的合作者将执行一项旨在模拟第一代重子天体的联合计划。第一步是自适应网格优化模拟，这是一种调整模拟长方体大小以反映物质密度的流行方法。这项工作自始至终包括基本的物理效应，如紫外线背景辐射场和通过超新星产生金属和能量。这些结果将使我们能够对这些过程将如何影响下一代有一个物理上的了解，并校准简单的分析处方。在第二步，他们将把这种定量和定性的认识与结构形成和再电离的半解析模型结合起来，为下一代地面和天基观测做出广泛的观测预测。一名研究生将以博士论文研究的形式开展拟议的工作。这些模拟将作为高质量可视化的基础，与国家超级计算应用中心和美国自然历史博物馆的人员合作，该团队的两名成员之前都曾与他们合作。另一项倡议将涉及纽约高中教师和学生的科学研究培训计划。