Collaborative Research: Galactic Winds and the Multiphase Structure of the Circum-Galactic Medium

合作研究：银河风和环银河介质的多相结构

• 批准号: 2205724
• 负责人: Thomas Quinn
• 金额: $ 43.95万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2205724&HistoricalAwards=false
• 关键词: Collaborative; Research; Galactic; Winds; Multiphase

Massive galaxies are embedded in a dynamic reservoir of particles and dark matter called the circumgalactic medium (CGM). The CGM not only represents a fossil record of galaxy formation, it also continues to shape their evolution through the interaction of cool infalling gas with outflows driven by stellar winds and supernovae. This research team will develop a state-of-the-art hydrodynamic galaxy simulation code to study the complex interplay between star formation induced outflows and the CGM. Synthetic UV absorption line spectra derived from these simulations will be directly compared with Hubble Space Telescope data to advance our understanding of the structure and dynamics of the CGM. These simulations will also be used in a program for pre-majors in science from underrepresented groups. The program will introduce them to the use of computer simulations in astrophysics and encourage them to consider a technically oriented major program of study. The research team will first incorporate the PhEW (Physically Evolved Winds) sub-grid model into the hydrodynamic galaxy simulation code ChaNGa and verify its accuracy. Once validated, they will begin modeling the CGM of current epoch Milky Way-like galaxies and begin making comparisons between the synthetic UV spectra with HST data. Through a series of such simulations that systematically explore a range of evolutionary paths, the team will try to assess which aspects of the CGM's absorption line properties are robust against galaxy history and which are more directly connected to star formation. Finally, the team will explore how CGM structure is affected by PhEW as a function of galaxy mass and environment by running a simulation that evolves galaxies within a cosmological volume (Romulus25; 25 Mpc sided cube). This will allow investigations of how the simulated HST/COS spectra vary as a function of galaxy type, mass, and environment and how the CGM evolves across these parameters.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

大规模星系嵌入颗粒和暗物质的动态储层中，称为卷乳介质（CGM）。 CGM不仅代表了星系形成的化石记录，而且还通过凉爽的插入气体与由恒星风和超新星驱动的外流的相互作用来塑造其进化。该研究团队将开发最先进的流体动力星系模拟代码，以研究恒星形成引起的流出和CGM之间的复杂相互作用。从这些模拟得出的合成UV吸收线光谱将直接与哈勃空间望远镜数据进行比较，以促进我们对CGM结构和动力学的理解。这些仿真也将在代表性不足的小组的科学前计划中使用。 该计划将向他们介绍计算机模拟在天体物理学中的使用，并鼓励他们考虑以技术为导向的主要研究计划。研究团队将首先将PHEW（物理进化的风）次级网格模型纳入流体动力学仿真代码Changa并验证其准确性。一旦验证，他们将开始对当前时代银河系状星系的CGM进行建模，并开始与HST数据进行合成紫外光谱进行比较。通过系统地探索一系列进化路径的一系列模拟，该团队将尝试评估CGM吸收线特性的哪些方面对银河系历史记录具有鲁棒性，并且哪些与恒星形成更直接相关。最后，该团队将通过运行在宇宙学量以内的星系（Romulus25; 25 MPC侧面立方体）的模拟来探讨CGM结构如何受PHEW的影响，这是GARAXY质量和环境的函数。这将允许研究模拟的HST/COS频谱如何随着星系类型，质量和环境而变化，以及CGM如何在这些参数中演变。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的审查标准来通过评估来支持的。