Structure and Dynamics of Neutral Gas in Spiral Galaxies: Numerical Models

这项研究试图通过一系列与时间相关的数值磁流体(MHD)模拟来推进对星际介质(ISM)的理论理解。它将在以前工作的基础上，在大范围的空间尺度上对国际空间管理的结构和动态方面展开新的调查。通过在MHD模拟中加入新的物理，这项研究将研究湍流原子ISM中的热力学平衡，扩散ISM云、混合组分、磁化的星系气体盘、旋臂刺和螺旋激波的形态和时间性质，以及恒星-气体系统中螺旋密度波的长期共同演化。这项工作包括开发用于将模拟结果与观测结果进行比较的诊断学。这些项目与天文学和天体物理学的其他活跃领域相联系，特别是射电天文学，其技术目标将有助于建立和使用广泛适用的计算工具。将有大量的学生培训和指导，重点是代表性不足的群体。模拟数据集将被发布给感兴趣的科学家。首席研究员预计将继续她目前在外联、公共关系和社区服务方面的广泛努力。

AST-0507315OstrikerThis research seeks to advance theoretical understanding of the interstellar medium (ISM) via a series of time-dependent numerical magnetohydrodynamic (MHD) simulations. It will build on previous work to launch a new inquiry into aspects of structure and dynamics in the ISM over a large range of spatial scales. By incorporating new physics in MHD simulations, this study will investigate thermodynamic balance in the turbulent atomic ISM, morphological and temporal properties of diffuse ISM clouds, mixed-component, magnetized galactic gas disks, spiral arm spurs and spiral shocks, and secular co-evolution of spiral density waves in star-gas systems. The work includes developing diagnostics for comparing simulation results with observations.These projects connect to other active areas of astronomy and astrophysics, especially radio astronomy, and the technical objectives will contribute to the building and use of widely applicable computational tools. There will be significant student training and mentoring, with an emphasis on under-represented groups. Simulation data sets will be released to interested scientists. The principal researcher expects to continue her current wide-reaching efforts in outreach, public relations and community service.