The Internal Kinematics of Dwarf Spheroidal Galaxies: Do they Contain Dark Matter?

矮球状星系的内部运动学：它们是否含有暗物质？

• 批准号: 9119343
• 负责人: Edward Olszewski
• 金额: $ 3万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9119343&HistoricalAwards=false
• 关键词: Internal; Kinematics; Dwarf; Spheroidal; Galaxies

It is now well established that much of the Universe is composed of nonluminous matter, but there is little or no evidence for what this material might be. Certain galaxies (dwarf spheroidal galaxies) are the most local external systems thought to contain dark matter, and are the simplest type of galaxy. They contain little or no gas and have had relatively simple star formation histories. Careful kinematic studies of these galaxies may provide the least ambiguous evidence for the nature of dark matter. The research to be supported by this grant will measure precise velocities of stars in three dwarf spheroidal galaxies in order to measure the velocity dispersion of the stars in these systems. The acquisition of precise velocities in each of these systems will allow the gravitational potential of these galaxies to be measured. The precise structure of these galaxies is rather poorly known, and photometry will be obtained which will substantially improve our knowledge of the structure of these low luminosity galaxies.

现在已经确定宇宙的大部分是由 但很少或根本没有证据表明 这种材料可能是。 某些星系（矮球状体 星系）被认为是最局部的外部系统， 暗物质是最简单的星系类型 它们含有 几乎没有气体，星星的形成相对简单 历史 对这些星系的仔细运动学研究可能会提供 暗物质本质的最明确证据 这项研究将得到资助， 三个矮球状星系中恒星的速度， 测量恒星在这些系统中的速度色散。 的 在这些系统中的每一个中获得精确的速度将 可以测量这些星系的引力势。 这些星系的精确结构知之甚少， 测光将获得这将大大提高我们的 了解这些低光度星系的结构。