The Galaxy / IGM Connection

这个项目是一项研究漫射星系间介质（IGM）与恒星和星系之间关系的协调努力。数值模拟将讨论第一批恒星、前星系天体和星系的形成，强调将这些生物与IGM（辐射效应、化学富集、动能和热能注入）联系起来的各种形式的反馈。从这项研究中得到的主要答案包括反馈对事物的影响程度，宇宙在不同时代之间改变的时间和方式（化学富集是主要因素吗？），星系的基石是什么——它们与第一批恒星有何不同，它们是否有可观察到的后果——以及IGM在何时和如何获得金属。改变分辨率和使用两种不同的数值方法将有助于验证结果并确保收敛，因为这是第一次尝试在适当的宇宙学背景下包括相关的物理效应。所有已开发的计算机程序，包括各种物理过程的不同编码方式，都将发布给社区使用。特别地，这包括被称为Enzo.***的“旗舰”自适应网格细化代码

AST-0307690HernquistThis project is a coordinated effort to study the relationship between the diffuse intergalactic medium (IGM) and stars and galaxies. Numerical simulations will address the formation of the first stars, of pre-galactic objects, and of galaxies, emphasizing the various forms of feedback connecting those beasties to the IGM (radiative effects, chemical enrichment, and kinetic and thermal injection of energy). The principal answers to be expected from this research include the extent to which feedback affects things, when and how the Universe changed gears between the different eras (was chemical enrichment a primary factor?), what were the galactic building blocks - how did they differ from the first stars, do they have observable consequences - and when and how the IGM acquired its metals. Varying the resolution and using two different numerical methods will help to validate the results and ensure convergence, since this is the first attempt to include the relevant physical effects in a proper cosmological context.All developed computer programs, including the different ways of coding the various physical processes, will be released for community use. In particular, this includes the 'flagship' adaptive mesh refinement code known as Enzo.***