CAREER: Feedback Tomography

Romeel Dave博士(亚利桑那大学)将使用最先进的流体动力学模拟技术进行反馈层析成像的理论研究，该模拟技术动态地结合了外流和复杂的化学演化。该计划建立在非常成功的宇宙尺度银河系外流模型的基础上，将重点放在星系的周围，以更好地了解银河晕内和周围的流入、流出和环境气体之间的复杂相互作用。主要目标是将可观察到的吸收谱线示踪剂与气体的物理性质，如运动学、密度、温度和金属丰度联系起来。通过仔细比较模型与现有的和即将获得的数据，将开发出一个宇宙框架的场景，说明质量、金属和能量是如何进出星系的。关于这种循环如何共同建立跨宇宙时间的银河系间介质和星系的关键性质，我们将进行研究。此外，还将探索在当前代码中改进和优化大规模外流建模的途径，使用仔细约束的测试问题。通过这一多方面的努力，对银河系外流及其对星系性质的影响的理解将大大推进。作为这项工作的一部分，戴夫博士将制作一部关于星系形成原理的教育电影，重点是观察和模拟如何协同工作，以增加我们对星系形成的理解。这一教学工具将被设计用于课堂或作为一部独立的电影观看，将被用来帮助激发教师和普通公众对河外天文学这一日益重要的次级领域的兴趣。此外，戴夫博士还将帮助加纳为来自美国和非洲的高级本科生制定和实施一个天文学留学项目。该项目将在第一周教授河外天文学的基本概念，然后教会学生利用在线观测和模拟数据库来询问和回答当前星系形成中的问题。

Dr. Romeel Dave' (University of Arizona) will carry out a theoretical study of feedback tomography using state of the art hydrodynamic simulations that dynamically incorporate outflows and sophisticated chemical evolution. Building on highly successful models of cosmic-scale galactic outflows, this program will focus on the environs of galaxies to better understand the complex interplay between inflows, outflows, and ambient gas in and around galactic halos. A primary goal will be to connect observable absorption-line tracers with physical properties of the gas such as kinematics, density, temperature, and metallicity. Through careful comparisons of models with available and forthcoming data, a cosmologically framed scenario will be developed for how mass, metals, and energy cycle in and out of galaxies. Implications will be investigated for how such cycling jointly establishes key properties of the inter-galactic medium and galaxies across cosmic time. Additionally, avenues will be explored for improving and optimizing the modeling of outflows on large scales within current codes, using carefully constrained test problems. Through this multi-faceted effort, the understanding of galactic outflows and their impact on galaxy properties will be greatly advanced. As a part of this work Dr. Dave' will produce an educational movie on the principles of galaxy formation, with a focus on how observations and simulations work together to increase our understanding of galaxy formation. This pedagogical tool, which will be designed to be used in classrooms or viewed as a stand-alone film, will be used to help spur interest in the increasingly important subfield of extragalactic astronomy, both among teachers and the general public. In addition, Dr. Dave' will help develop and conduct an astronomy study abroad program in Ghana for advanced undergraduates from the United States and Africa. The program will teach basic concepts of extragalactic astronomy in the first week, and then teach students to utilize online observational and simulation databases to ask and answer questions about current problems in galaxy formation.