Evolution of the Intergalactic Medium

星际介质的演化

• 批准号: 0507521
• 负责人: Renyue Cen
• 金额: --
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-15 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0507521&HistoricalAwards=false
• 关键词: Evolution; Intergalactic; Medium

AST-0507521CenIt is well established that gravitational instability is the dominant force driving the formation of baryonic structures. However, feedback processes on the intergalactic medium (IGM) from star formation are not well understood, although observationally the phenomenon of galactic super-winds (GSW) is common in both low redshift starburst galaxies and high redshift Lyman break galaxies. Lack of an adequate treatment of GSW and other important physical processes in cosmological hydrodynamic simulations hampers a full understanding of the evolution of the IGM. This research will carry out adaptive mesh refinement hydrodynamic simulations with all likely relevant physical processes carefully treated, to compute more precisely the evolution of the IGM, and specifically, the warm-hot IGM (WHIM) at low redshift and the Lyman alpha forest at moderate redshift. This will produce a detailed characterization of the distribution of the WHIM, allowing future observational determination of the fraction of the cosmic baryons in this state. It will also help to quantify systematic errors, again allowing future observational constraints on the matter power spectrum to be accurate enough to shed useful light on inflationary theories. This research will set up an adequate framework to interpret the vast observational database on evolution of the IGM, in a physically self-consistent fashion.Broader impacts of this work include continuing an effective outreach program to the general public, using visualizations presented through effective channels, such as at the Rose-Hayden Planetarium of the American Museum of Natural History, and public television programs such as Nova.

AST-0507521Cenit很好地确定了重力不稳定性是驱动重型型结构形成的主要力。 然而，尽管从观察者看，恒星形成的恒星形成的反馈过程（IgM）尚不清楚，尽管从观察者看，银河超级风的现象（GSW）在低红移星系和高红移莱曼破裂星系中很常见。 缺乏对宇宙学水动力模拟中GSW和其他重要物理过程的充分处理，这阻碍了对IGM的演变的完全理解。 这项研究将进行自适应网状精炼水力动力模拟，并使用经过精心处理的所有可能相关的物理过程，以更准确地计算IgM的演变，特别是在低红移和中等红移的Lyman Alpha Forest上的热热IGM（WHIM）。 这将产生对偶然性分布的详细表征，从而使未来的观察性确定该状态的宇宙重子的分数。 它还将有助于量化系统错误，再次允许对物质功率谱的未来观察限制足以准确地阐明通货膨胀理论。 This research will set up an adequate framework to interpret the vast observational database on evolution of the IGM, in a physically self-consistent fashion.Broader impacts of this work include continuing an effective outreach program to the general public, using visualizations presented through effective channels, such as at the Rose-Hayden Planetarium of the American Museum of Natural History, and public television programs such as Nova.