Collaborative Research: Chemistry and Structure Formation at High Redshift

AST-0088213亚历山大Dalgarno这是一个合作研究项目与博士菲利普Stanford，（乔治大学，AST 0087172），和斯蒂芬莱普，（内华达州大学，拉斯维加斯，AST 0087348）。该计划将构建模型来研究第一个宇宙学物体的形成。这些模型将描述早期宇宙中由原始气体形成的第一个束缚物体的历史。它们将包括耦合演化的时间依赖性，非平衡化学，原子和分子水平的人口，以及非平衡振转水平人口的分子与贡献，由于在原始气体中的化学反应。这些模型可用于建议从太空用红外线观测早期宇宙结构的策略。该方案将利用天体物理学建模来研究第一批宇宙学物体的形成。这些模型将计算的时间相关的非平衡化学，原子和分子水平的人口，热和流体动力学的历史的第一个绑定对象形成的原始气体的耦合演化。这将是第一次尝试如此广泛的耦合进化模型。 此外，该项目将研究原始分子的显式非平衡振转能级布居数，这些分子由于化学反应而作出贡献，从而改进了对分子冷却的测定和对原始云发射光谱的预测。发射光谱将被用来建议下一代红外空间望远镜可能观测这些物体的最可能方式。所需的原子和分子数据以及导出的冷却功能将被组装并发布在万维网上。数据是不可用的，主要涉及振转态特定的分子碰撞，将计算与建立量子力学技术。对原始气体的研究将扩展到在金属丰度和辐射场条件增加的情况下原星系和原恒星的形成，直到第二星族时代的开始。这些研究将有助于解释和规划未来利用NGST、SIRTF、FIRST和Astro-F以及地面望远镜进行的天基观测。该项目的资金由美国国家科学基金会的河外天文宇宙学计划（AST/EXC）提供。

AST-0088213Alexander DalgarnoThis is a collaborative research project with Drs Phillip Stancil, (the University of Georga, AST0087172), and Stephen Lepp, (University of Nevada, Las Vegas, AST0087348). This program will construct models to investigate the formation of the first cosmological objects. These models will describe the history of the first bound objects to form from the primordial gas in the early universe. They will include the coupled evolution of the time-dependent, nonequilibrium chemical, atomic and molecular level populations as well as the nonequilibrium rovibrational level populations of the molecules with contributions due to chemical reactions in the primordial gas. The models can be used to suggest strategies for observing structures in the early universe in the Infrared from space.This program will use astrophysical modeling to investigate the formation of the first cosmological objects. These models will compute the coupled evolution of the time-dependent nonequilibrium chemical, atomic and molecular level population, thermal, and hydrodynamic history of the first bound objects to form from the primordial gas. This will be the first time such extensive, coupled evolution models have been attempted. In addition, this project will investigate the explicit nonequilibrium rovibrational level populations of the primordial molecules with contributions due to chemical reactions, resulting in an improved determination of molecular cooling and the prediction of the emission spectra of primordial clouds. The emission spectra will be used to suggest the most likely ways these objects may be observed with the next generation of infrared space telescopes. The needed atomic and molecular data and derived cooling functions will be assembled and posted on the World Wide Web. The data that is not available, primarily involving rovibrational state-specific molecular collisions, will be computed with established quantum-mechanical techniques. The studies of the primordial gas will be extended to follow protogalaxy and protostar formation under increasing metallicity and radiation field conditions to the beginning of the era of Population II. These studies will be relevant to the interpretation and planning of future space-based observations with NGST, SIRTF, FIRST, and Astro-F and ground-based telescopes. Funding for this project was provided by the NSF program for Extragalactic Astronomy & Cosmology (AST/EXC).***