Collaborative Research: Bringing Primordial Microphysics out of the Dark Ages: Advanced Chemistry and Cooling Calculations for First Star Formation and Evolution

合作研究：将原始微观物理学带出黑暗时代：第一颗恒星形成和演化的先进化学和冷却计算

• 批准号: 0607733
• 负责人: Phillip Stancil
• 金额: $ 13.75万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-01 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607733&HistoricalAwards=false
• 关键词: Collaborative; Research; Bringing; Primordial; Microphysics

AST-0607733StancilRecent significant advances in our understanding of the early Universe can be attributed to impressive developments in numerical hydrodynamics, radiative transfer, and nucleosynthetic modeling, as well as spectacular observational efforts. However, while it is accepted that microphysical processes play an important, if not controlling, role in the formation and evolution of the first stars, improvements in the treatment of chemistry and molecular excitation have been lacking. This program of new atomic and molecular calculations, in conjunction with astrophysical modeling of early star formation and evolution, will bring the treatment of primordial microphysics to state-of-the-art. Explicit quantum-mechanical calculation of various hydrogen and deuterium reactions will be combined with current chemistry and cooling models and added into hydrodynamical calculations of a range of early star formation and evolution pictures. Emphasis will be placed on non-LTE molecular level populations and the resultant molecular spectra. The primordial chemical/cooling network will then be extended to include heavy elements such as carbon and oxygen. Astrophysical studies including this state-of-the-art microphysics will investigate the photon escape fraction from Population III stars embedded in halos, the formation of low-mass Population III stars in fossil ionized hydrogen regions, and metal dispersal behavior from Population III supernovae. This work will advance the understanding of primordial and low-metallicity chemistry by applying state-of-the-art atomic and molecular computations to new problems.Results will be added to a web-accessible database of reactions and code modules relevant to primordial astrochemistry. The project includes the training of graduate students, and extending current activities for the participation of undergraduate students and under-represented groups, enhancing the infrastructure of astrochemical research and strengthening interdisciplinary collaborations. In addition, the techniques and results are applicable to other areas such as fusion energy, combustion research, and atmospheric chemistry.

AST-0607733 Stancil最近我们对早期宇宙的理解取得了重大进展，这要归功于数值流体力学、辐射传输和核合成建模方面令人印象深刻的发展，以及壮观的观测工作。 然而，虽然人们认为微物理过程在第一批恒星的形成和演化中起着重要的作用，如果不是控制作用的话，但在化学和分子激发的处理方面一直缺乏改进。 这一新的原子和分子计算方案，结合早期星星形成和演化的天体物理模型，将把原始微观物理学的处理带到最先进的水平。各种氢和氘反应的明确量子力学计算将与当前的化学和冷却模型相结合，并加入到早期星星形成和演化图片的流体动力学计算中。 重点将放在非LTE分子水平的人口和由此产生的分子光谱。 然后，原始化学/冷却网络将扩展到包括碳和氧等重元素。 天体物理学研究，包括这种最先进的微观物理学将调查光子逃逸分数从第三族恒星嵌入晕，形成低质量的第三族恒星在化石电离氢区域，和金属分散行为从第三族超新星。 这项工作将通过将最先进的原子和分子计算应用于新的问题来促进对原始和低金属含量化学的理解，其结果将被添加到与原始天体化学有关的反应和代码模块的网络访问数据库中。 该项目包括培训研究生，扩大目前的活动，让本科生和代表性不足的群体参与，加强天体化学研究的基础设施，加强跨学科合作。 此外，该技术和结果也适用于其他领域，如聚变能，燃烧研究和大气化学。