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.

现在已经很好地确定，大部分宇宙都是由无浮力物质组成的，但是几乎没有证据表明这种材料可能是什么。 某些星系（矮球星系）是最本地的外部系统，被认为包含暗物质，是最简单的星系类型。 它们几乎没有气体或没有气体，并且具有相对简单的恒星形成历史。 对这些星系的仔细的运动学研究可能为暗物质本质提供了最不明确的证据。 该赠款支持的研究将测量三个矮人球星系中恒星的精确速度，以测量这些系统中恒星的速度分散。 这些系统中每个系统中的精确速度的采集将允许测量这些星系的重力潜力。 这些星系的确切结构是鲜为人知的，将获得光度法，这将显着提高我们对这些低光度星系结构的了解。