Collaborative Research: Distances to high-velocity clouds

合作研究：到高速云的距离

• 批准号: 0907877
• 负责人: Bastiaan Wakker
• 金额: $ 39.72万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0907877&HistoricalAwards=false
• 关键词: Collaborative; Research; Distances; velocity; clouds

This collaborative award will fund continuation of a project to measure distances to the Galactic high velocity clouds (HVCs), massive clouds of neutral hydrogen gas moving at velocities incompatible with a simple model of differential galactic rotation. Since they stand out from the gas in the Galactic Disk, they can be used as test particles for energetic phenomena in the Milky Way. The program will study HVC metallicities and distances using interstellar absorption lines in the spectra of stars projected against the clouds. The results of this project will be important for estimates of several fundamental parameters of Galactic evolution, including the rate of infall of low metallicity gas, the potential of the dark matter halo, the rate of circulation of gas between Disk and Halo, and the fraction of ionizing photons escaping the Disk.The Broader Impacts of this program include training of graduate and undergraduate students.

该合作奖将资助一个项目的继续，该项目测量到银河高速云（HVCs）的距离，HVCs是由大量中性氢气组成的云，其移动速度与银河系微分旋转的简单模型不相容。因为它们在银河盘的气体中很突出，所以它们可以被用作银河系中高能现象的测试粒子。该计划将研究HVC的金属丰度和距离，利用恒星光谱中的星际吸收线投射到云层上。这个项目的结果将对银河系演化的几个基本参数的估计很重要，包括低金属丰度气体的落入率，暗物质晕的潜力，盘和晕之间气体的循环率，以及逃离盘的电离光子的比例。该计划的更广泛影响包括研究生和本科生的培训。