Physics and Phenomenology of Galactic Winds

银河风的物理学和现象学

• 批准号: 1516967
• 负责人: Todd Thompson
• 金额: $ 36.3万
• 依托单位: Ohio State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1516967&HistoricalAwards=false
• 关键词: Physics; Phenomenology; Galactic; Winds

The stars, like our Sun, generate winds of very hot particles that fill the space between stars. Particle winds are also created in clouds of gas where stars form, and especially strong winds occur during supernovae explosions. The investigators will study the physics, evolution, dynamics, and implications of the different sources of galactic winds in several types of galaxies, from star-forming dwarf galaxies to ultra-luminous starburst galaxies.A significant part of the proposed work will be carried out by graduate students, providing training in cutting-edge research. Results will be broadly disseminated by publication in peer-reviewed journals, conference proceedings, and by the press. In addition, the investigators propose an education and outreach component that targets senior citizens, an important and growing, yet traditionally significantly under-served group.The investigators will provide deliverables that will broadly impact the scientific community. They will directly evaluate the importance of new physics for the structure of galactic winds, an important guide to the essential physics for current and future multi-dimensional simulations. They will isolate important physical effects in time-dependent simulations that may provide the key pieces to allow modelers to understand their calculations. Finally, they will provide a tool for connecting the underlying theory to observations and vice versa. Overall, this proposal serves to community in two ways --- first, by exploring newly opened up discovery spaces and second, by mapping these spaces for those who can use the results immediately. The investigators' goal is to simultaneously address the physics and phenomenology of galactic winds, connecting theory and observation. They will do both broad sweeps through parameter space, and focused studies of individual systems. Among the projects they will pursue, they will (1) calculate the ram pressure acceleration of cool clouds by hot outflows, (2) understand the ability of hot metal-rich winds to cool radiatively, producing cool clouds in situ, (3) assess the interaction of a hot flow, potentially loaded with cool clouds, with the surrounding circumgalactic medium in an effort to explain recent observations, (4) calculate the acceleration of clouds by momentum deposition, including a comparison of theory and data for individual galaxies and large surveys, (5) understand the interaction of momentum deposition in turbulence, and (6) calculate the dynamics of two-fluid dust+gas radiation hydrodynamical flows.

这些恒星，就像我们的太阳一样，会产生非常热的粒子风，这些粒子风充满了恒星之间的空间。在恒星形成的气体云中也会产生粒子风，尤其是在超新星爆炸期间会产生强风。研究人员将在不同类型的星系（从形成恒星的矮星系到超亮的星暴星系）中研究星系风的物理、演化、动力学和不同来源的含义。拟议工作的很大一部分将由研究生进行，提供前沿研究方面的培训。研究结果将通过同行评议的期刊、会议记录和新闻界广泛传播。此外，调查人员还提出了针对老年人的教育和推广组成部分，这是一个重要的、不断增长的群体，但传统上却明显得不到服务。研究人员将提供对科学界产生广泛影响的成果。他们将直接评估新物理学对星系风结构的重要性，这是对当前和未来多维模拟的基本物理学的重要指导。他们将在与时间相关的模拟中分离出重要的物理效应，这可能为建模者理解他们的计算提供关键的部分。最后，他们将提供一种工具，将基础理论与观察联系起来，反之亦然。总的来说，这个提议以两种方式服务于社区——首先，通过探索新开放的发现空间，其次，通过为那些可以立即使用结果的人绘制这些空间。研究人员的目标是同时解决星系风的物理学和现象学问题，将理论和观测联系起来。他们将对参数空间进行广泛的扫描，并对单个系统进行集中研究。在他们将要进行的项目中，他们将(1)通过热流出计算冷云的撞击压力加速度，(2)了解富含热金属的风的辐射冷却能力，在现场产生冷云，(3)评估可能装载冷云的热流与周围星系介质的相互作用，以努力解释最近的观测结果，(4)通过动量沉积计算云的加速度。包括对单个星系和大型巡天的理论和数据的比较，(5)了解湍流中动量沉积的相互作用，(6)计算两流体尘埃+气体辐射流体动力学流动的动力学。