Theoretical Studies of the Structure and Dynamics of Cloudy Interstellar Medium Spiral Galaxies

云状星际介质螺旋星系结构与动力学的理论研究

• 批准号: 8712084
• 负责人: William Roberts
• 金额: $ 10.34万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-04-15 至 1991-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8712084&HistoricalAwards=false
• 关键词: Theoretical; Studies; Structure; Dynamics; Cloudy

Theoretical and computational studies on the important classic problem of the dynamics of galactic gas flows and the roles played by the gas in the structure and dynamics of galaxies will be carried out. Normal and barred spiral galaxies will be a major focus of the research of the wealth of improved and detailed observational data that has become available in recent years, now making possible new definitive tests and comparisons with observations. Cloud-particle galactic gas dynamics and continuum gas dynamics are essential in the multipronged program of research. Detailed simulations of full galactic disks and higher resolution simulations of selected local regions will be studied in parallel to better understand the relationship between grand design and local spiral arm morphologies. The effects of self gravitation among clouds, magnetic field interactions, and star formation processes will also be primary areas of focus. The local effective viscosity of the cloud is determined from the cloud-particle simulations and used to produce a generalized continuum gas dynamical description of galactic gas flows that properly simulates the average transport properties of the cloudy interstellar medium (ISM). The utilization of computational simulation in this work is a topic of great significance at the present time and is a separate major thrust area. The high spatial resolution of the simulations will be utilized to make definitive comparisons with observations and provide careful tests for theoretical predictions based on local stability analyses.

针对星系气体流动动力学这一重要经典问题以及气体在星系结构和动力学中的作用开展理论和计算研究。 正常和棒旋星系将成为近年来获得的大量改进和详细观测数据研究的主要焦点，现在使得新的确定性测试和与观测的比较成为可能。 云粒子星系气体动力学和连续气体动力学对于多管齐下的研究计划至关重要。 将并行研究全星系盘的详细模拟和选定局部区域的高分辨率模拟，以更好地理解总体设计和局部旋臂形态之间的关系。 云间自引力、磁场相互作用和恒星形成过程的影响也将是主要关注领域。 云的局部有效粘度是根据云粒子模拟确定的，并用于生成银河气流的广义连续气体动力学描述，该描述正确地模拟了云状星际介质（ISM）的平均传输特性。 在这项工作中使用计算模拟是目前一个具有重要意义的主题，也是一个单独的主要推动领域。 模拟的高空间分辨率将用于与观测结果进行明确的比较，并为基于局部稳定性分析的理论预测提供仔细的测试。