Integrating precision observations and simulations of the Intergalactic Medium

整合星际介质的精确观测和模拟

• 批准号: 0808168
• 负责人: David Tytler
• 金额: $ 79.92万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0808168&HistoricalAwards=false
• 关键词: Integrating; precision; observations; simulations; Intergalactic

AST-0808168TytlerThe intergalactic medium is most of the volume of the Universe and until recently it contained most of the dark matter and gas. This project is a tight combination of precision measurements of the intergalactic medium through absorption in quasar spectra with a suite of simulations designed to extract the physical parameters from those measurements. It will provide new estimates of cosmologically interesting parameters, including the baryonic, dark matter and dark energy contents, and the amount of clustering of matter on small scales, which are more accurate than those obtained before from the intergalactic gas, and completely independent of those from supernovae, galaxies and the cosmic microwave background. For all parameters the errors will be comparable to the best of any method. The work will also give much more accurate measurements of the temperature of the intergalactic gas, and the intensity of the ultraviolet background radiation. Sophisticated calibrations of spectra will make them suitable for determining which set of parameters makes the simulated spectra most like the real spectra. Some simulations will include radiative transfer so as to interpret absorption near to individual quasars.This team has a long record of integrating education and diversity with their research. Students receive intensive instruction in astrophysics, cosmology and the methods of precision measurement, observing with the Keck and Lick telescopes, and learn to run a large code on state-of-the-art supercomputers. Most undergraduates will also become co-authors on one or two papers.

AST-0808168TYTLERTERTHETHETHETHATHACTIC介质是宇宙的大部分体积，直到最近它包含大多数暗物质和气体。 该项目是通过在类星体光谱中吸收与仿制的模拟相结合的精确测量，该项目旨在从这些测量中提取物理参数。 它将提供有关宇宙学有趣的参数的新估计值，包括重型，暗物质和暗能量含量，以及在小尺度上的物质聚类量，这些量表比从葡萄膜间气体中获得的更准确，并且完全独立于超级小型，星系，银河系和宇宙微波炉。 对于所有参数，错误将与任何方法中的最佳选择相媲美。 这项工作还将提供更准确的测量，即对层状气体的温度以及紫外线背景辐射的强度。 光谱的复杂校准将使它们适合确定哪种参数使模拟光谱最像真实光谱。 一些模拟将包括辐射转移，以解释与单个类星体附近的吸收。该团队在将教育和多样性与研究融为一体的记录中很长。 学生可以接受天体物理学，宇宙学和精确度量方法的密集指导，与Keck和Lick望远镜观察，并学会在最先进的超级计算机上运行大型代码。 大多数大学生也将成为一两个论文的合着者。