Collaborative Research: The Destruction and Growth of Halo Clouds

合作研究：晕云的破坏和增长

• 批准号: 2307693
• 负责人: Mary Putman
• 金额: $ 39.98万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2307693&HistoricalAwards=false
• 关键词: Collaborative; Research; Destruction; Growth; Halo

In order for a galaxy to form new stars, the galaxy gathers more hydrogen gas. This gas is thought to rain down onto the galaxy, and indeed, gas clouds of different shapes and sizes are already found around the Milky Way galaxy. Because we see a single snapshot in time, the fate of these gas clouds is not actually known. This project will determine whether the hydrogen clouds grow as they fall into the galaxy as star formation fuel, or if the clouds will be scattered and destroyed as they fall. The investigators will compare computer simulations of clouds moving towards a galaxy to new observations of clouds near the Milky Way. Students will be trained how to conduct scientific research, and the observations will be shared with the public. The physical processes behind the destruction and growth of cool gas clouds in a hot medium is a long standing astrophysical problem. An ideal testing ground for recent theoretical advances is in our own Milky Way, in particular in the halo of our Galaxy, where discrete clouds can be easily isolated, are largely separate from the process of star formation, and are well observed. Detailed comparisons will be made, in the observational plane, of new high-resolution observations of halo clouds to high-fidelity magnetohydrodynamic simulations of the cloud destruction and growth. To complete the comparison between the simulations and observations, a library of simulated clouds with varying physical conditions will be created, and a suite of observational data on clouds with distance constraints will be prepared. The simulated clouds will be put onto the observational plane to compare the spatial morphologies and velocity structures. In addition to the research experiences for students, the project will develop a science service learning course that will teach undergraduates better methods for explaining scientific research to the local community.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.

为了使银河系形成新的恒星，银河系会收集更多的氢气。 人们认为这种气体会下雨到银河系上，实际上，在银河系中已经发现了不同形状和尺寸的气云。 因为我们会看到一个快照，所以这些气体云的命运实际上并不知道。该项目将确定氢云是否随着恒星形成燃料而掉入银河系时是否生长，或者是否会随着云而散落和破坏。 调查人员将比较对朝着银河系的云的计算机模拟与银河系附近云的新观察结果。 将对学生进行科学研究的培训，并将与公众分享观察结果。 在热介质中，凉气云破坏和生长的物理过程是一个长期存在的天体物理问题。最新理论进步的理想测试基础是我们自己的银河系，尤其是在我们银河系的光环中，在我们的银河系中，可以很容易地隔离离散的云，与恒星形成的过程很大程度上分开，并且可以很好地观察到。将在观测平面上进行详细的比较，将光环云的新高分辨率观察到对云破坏和生长的高保真磁流失动力学模拟。 为了完成模拟和观察之间的比较，将创建一个具有不同物理条件的模拟云库，并准备一套具有距离约束的云的观察数据。 模拟云将被放在观测平面上，以比较空间形态和速度结构。除了针对学生的研究经验外，该项目还将开发科学服务学习课程，该课程将教授在本地社区解释科学研究的更好方法。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评估标准来通过评估来获得支持的。