Early Coevolution of Massive Black Holes and Stellar Systems in the First Galaxies

第一个星系中大质量黑洞和恒星系统的早期共同演化

• 批准号: 0708795
• 负责人: Volker Bromm
• 金额: $ 39.81万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-15 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0708795&HistoricalAwards=false
• 关键词: Early; Coevolution; Massive; Black; Holes

AST-0708795BrommMassive black holes (MBHs) are ubiquitous in luminous galaxies, and their mass is correlated with the properties of the host galaxy. It is therefore plausible that MBHs played an important role in the formation of structure in the Universe. This project will study the early coevolution of MBHs and their host galaxies, at the end of the cosmic dark ages. The research will examine key physical processes, including the hierarchical merging of dark matter halos; heating, cooling, and gas inflow inside the first HII regions; how to establish steady accretion onto the first black holes; global angular-momentum-transporting gravitational instabilities; the onset of fragmentation and star formation; establishing the first multiphase dusty interstellar medium; radiative and mechanical launching of winds and outflows; and the merging of smaller black holes into larger ones. These processes are complex and involve multiple physical scales, so large-scale numerical simulations will be developed to accompany the analytical methods being used. In order to pay careful attention to numerical accuracy and systematics, those simulations will use multiple methods, including smoothed-particle hydrodynamics, grid-based hydrodynamics with adaptive mesh refinement, and appropriate radiation transfer and sink-particle stellar dynamics. The results will address some of the key open questions in cosmology, including how the first galaxies formed, whether the MBH or the host stellar system came first, and when was the tight correlation between MBHs and hosts established in different environments?Because this research addresses the observable spectral properties of the first objects, it will be a valuable guide for astronomical searches with the next-generation of infrared facilities. It will also help to reduce theoretical uncertainties in estimates of low-frequency gravitational radiation bursts. Involved graduate and undergraduate students will learn cutting-edge methodologies with many and varied applications. Unprecedented animations of the first galaxies and early black hole accretion flows will be used in teaching and to disseminate knowledge about one of the least well-understood epochs in the evolution of structure in the Universe. This research will assist Dr Bromm as he continues to write articles for the popular science press.

AST-0708795Bromm大质量黑洞（MBH）在发光星系中无处不在，它们的质量与宿主星系的特性相关。 因此，MBH 在宇宙结构的形成中发挥了重要作用，这似乎是合理的。 该项目将研究宇宙黑暗时代末期MBH及其宿主星系的早期共同演化。 该研究将研究关键的物理过程，包括暗物质晕的分层合并；第一个 HII 区域内的加热、冷却和气体流入；如何在第一个黑洞上建立稳定的吸积；全球角动量传输引力不稳定性；碎裂和恒星形成的开始；建立第一个多相尘埃星际介质；风和外流的辐射和机械发射；以及较小的黑洞合并成较大的黑洞。 这些过程很复杂，涉及多个物理尺度，因此将开发大规模数值模拟来配合所使用的分析方法。 为了特别注意数值准确性和系统性，这些模拟将使用多种方法，包括平滑粒子流体动力学、具有自适应网格细化的基于网格的流体动力学，以及适当的辐射传输和下沉粒子恒星动力学。 研究结果将解决宇宙学中一些关键的开放性问题，包括第一个星系是如何形成的，MBH还是主恒星系统先出现，以及MBH和主恒星系统之间的紧密相关性是何时在不同环境中建立的？因为这项研究解决了由于第一批物体的可观测光谱特性，它将成为下一代红外设施进行天文搜索的宝贵指南。 它还将有助于减少低频引力辐射爆发估计的理论不确定性。 参与其中的研究生和本科生将学习具有多种应用的前沿方法。 第一个星系和早期黑洞吸积流的前所未有的动画将用于教学和传播有关宇宙结构演化中最难理解的时代之一的知识。 这项研究将帮助布罗姆博士继续为科普出版社撰写文章。