Theoretical Models of Helium Reionization

氦再电离的理论模型

• 批准号: 0607470
• 负责人: Steven Furlanetto
• 金额: $ 35.85万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2008-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607470&HistoricalAwards=false
• 关键词: Theoretical; Models; Helium; Reionization

AST-0607470FurlanettoThe reionization of hydrogen and helium are landmark events in the history of the Universe, constituting important phase transitions for the intergalactic medium (IGM) and impacting later structure formation everywhere. Although hydrogen reionization has received the most attention, exciting new data on helium are coming from far-ultraviolet spectra of moderate redshift quasars. This project aims to build a physically motivated, comprehensive model for helium reionization, including source clustering, inhomogeneities, and the correlations between sources and absorbers. The analytic model will be compared to numerical simulations and then tested against existing and future observations. The end result will reveal a lot about the intrinsic properties of the sources and their relation to the IGM.There is a tightly integrated educational component, including a graduate student's thesis work, and undergraduate research through existing programs at Yale University; the project is modular and lends itself well to short-term but meaningful research. This work should have wide repercussions within the astrophysical community, with implications for quasar evolution, the IGM, and structure formation.

AST-0607470Furlanetto氢和氦的再电离是宇宙历史上的里程碑事件，构成了星系间介质（IGM）的重要相变，并影响了后来各地结构的形成。 尽管氢再电离受到了最多的关注，但关于氦的令人兴奋的新数据来自中红移类星体的远紫外光谱。 该项目旨在建立一个物理驱动的氦再电离综合模型，包括源聚类、不均匀性以及源和吸收体之间的相关性。 分析模型将与数值模拟进行比较，然后根据现有和未来的观察结果进行测试。 最终结果将揭示很多关于来源的内在属性及其与 IGM 的关系。有一个紧密集成的教育部分，包括研究生的论文工作，以及通过耶鲁大学现有项目进行的本科生研究；该项目是模块化的，非常适合短期但有意义的研究。 这项工作应该在天体物理学界产生广泛的影响，对类星体演化、IGM 和结构形成都有影响。