CAREER: Feedback Tomography

罗密尔·戴夫博士（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流出和复杂的化学演化。建立在非常成功的宇宙尺度星系流出模型的基础上，该项目将专注于星系周围，以更好地理解流入、流出和星系晕内及周围环境气体之间复杂的相互作用。主要目标是将可观察到的吸收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。通过将模型与现有的和即将到来的数据进行仔细的比较，一个宇宙学框架的场景将被开发出来，用于描述质量、金属和能量如何在星系内外循环。将研究这种循环如何在宇宙时间内共同建立星系间介质和星系的关键特性。此外，将探索使用谨慎约束的测试问题在当前代码中改进和优化大规模流出建模的途径。通过这种多方面的努力，对星系外流及其对星系特性的影响的理解将大大提高。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共同工作，以增加我们对星系形成的理解。这个教学工具将被设计成在课堂上使用或作为一部独立的电影观看，它将被用来帮助激发教师和公众对越来越重要的星系外天文学分支领域的兴趣。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开发和开展一项天文学海外研究项目。该项目将在第一周教授星系外天文学的基本概念，然后教学生利用在线观测和模拟数据库来询问和回答有关星系形成的当前问题。

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.