Modeling the Cosmic Melting Pots in the Outskirts of Galaxies and Galaxy Clusters

模拟星系和星系团外围的宇宙大熔炉

• 批准号: 1412768
• 负责人: Daisuke Nagai
• 金额: $ 49.4万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-15 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1412768&HistoricalAwards=false
• 关键词: Modeling; Cosmic; Melting; Pots; Outskirts

Understanding the growth of galaxies and galaxy clusters is one of the most significant outstanding problems in our knowledge of the universe. On the largest scales, the universe has a filamentary structure, with gas and dark matter interweaving in a series of threads. The gradual flow and build-up of gas along this "cosmic web" ultimately leads to the formation of protogalaxies and protoclusters. Despite this, the precise manner in which galaxies and their clusters eventually form remains poorly understood. A breakthrough step, enabled by this research, is to connect and synthesize our knowledge of the gas in the outskirts of galaxies with that in galaxy clusters.This program will address a number of critical questions regarding the structure and flow of gas by using a suite of high-resolution cosmological simulations. The PI will principally use the Adaptive Refinement Tree (ART) code, but will also compare the results of these simulations with detailed multi-wavelength observations of clusters and the circumgalactic medium. The work will lead to new insights into the baryon budgets in galaxies and clusters, the impact of galactic feedback on extended halo gas, the environmental dependence of galaxy evolution, and the quenching of star formation in galaxies. The PI will also develop a hands-on computational astrophysics curriculum to expand minority involvement in computational science, in collaboration with the Science, Technology, and Research Scholars (STARS) program at Yale University. Furthermore, the data products of the simulations will be made available via online publicly-accessible databases.

了解星系和星系团的增长是我们对宇宙认识中最重要的突出问题之一。在最大的尺度上，宇宙具有丝状结构，气体和暗物质交织在一系列线上。气体沿着这张“宇宙网”逐渐流动和积聚，最终导致原星系和原星系团的形成。尽管如此，星系及其星系团最终形成的确切方式仍然知之甚少。这项研究的一个突破性进展是将我们对星系外围气体和星系团中气体的知识联系起来并加以综合。这个项目将通过一套高分辨率的宇宙学模拟来解决一些关于气体结构和流动的关键问题。PI将主要使用自适应精化树(ART)代码，但也会将这些模拟的结果与星系团和环星系介质的详细多波长观测进行比较。这项工作将导致对星系和星系团中的重子预算、星系反馈对扩展晕气体的影响、星系演化的环境依赖性以及星系中恒星形成的猝灭等问题有了新的见解。PI还将与耶鲁大学的科学、技术和研究学者(STAR)计划合作，开发一门动手操作的计算天体物理学课程，以扩大少数族裔对计算科学的参与。此外，模拟的数据产品将通过在线公众可访问的数据库提供。