Precision Measurements in the Intergalactic Medium: Simulations and Observations

星际介质中的精密测量：模拟和观测

• 批准号: 0507717
• 负责人: David Tytler
• 金额: $ 82.6万
• 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: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0507717&HistoricalAwards=false
• 关键词: Precision; Measurements; Intergalactic; Medium; Simulations

AST-0507717TytlerThe space between the galaxies is most of the volume of the Universe, and contains most of the dark matter and gas. That gas is readily observed in the spectra of quasars and its detailed properties contain a highly sensitive record of the main parameters of the Universe. This project will use a combination of observations and simulations to read that record, focusing on two key interrelated topics: the measurement of precise cosmological and astrophysical parameters, and the detection and measurement of the effects of energy flows from quasars and galaxies into the intergalactic gas. A large set of high resolution quasar spectra from the Keck observatory will be compared to various sophisticated simulations to study the amount of dark energy, the amplitude and slope of the power spectrum of matter on small scales, the ionization and temperature of the intergalactic gas, the intensity and spectrum of the ionizing radiation, and the energy input from quasars and galaxies, including the input and distribution of metals.The broader impact of the work builds upon the team's long record of integrating education and diversity with their research. Past emphasis on under-represented groups will continue.

AST-0507717Tytler星系之间的空间占宇宙体积的大部分，并且包含大部分暗物质和气体。 这种气体很容易在类星体的光谱中观察到，其详细特性包含宇宙主要参数的高度敏感记录。 该项目将结合观测和模拟来解读该记录，重点关注两个关键的相互关联的主题：精确的宇宙学和天体物理参数的测量，以及检测和测量从类星体和星系到星系间气体的能量流的影响。 来自凯克天文台的大量高分辨率类星体光谱将与各种复杂的模拟进行比较，以研究暗能量的数量、小尺度上物质功率谱的幅度和斜率、星系际气体的电离和温度、电离辐射的强度和光谱，以及类星体和星系的能量输入，包括金属的输入和分布。这项工作的更广泛影响 建立在团队将教育和多样性与研究相结合的长期记录之上。 过去对代表性不足群体的重视将继续下去。