Collaborative Research: A New Era of Mapping Dark Matter in Dwarf Spheroidal Galaxies

合作研究：绘制矮球状星系暗物质图谱的新时代

• 批准号: 0205790
• 负责人: Edward Olszewski
• 金额: --
• 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: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0205790&HistoricalAwards=false
• 关键词: Collaborative; Research; New; Era; Mapping

AST 0205790OlszewskiDwarf spheroidal galaxies (dSph) are likely to be the smallest systems in the Universe which contain both dark matter and luminous matter. The dark matter content and distribution in dSphgalaxies can be studied in detail if one can collect enough kinematic data to constrain models. Dr. Mario Mateo, at the University of Michigan, and Dr. Edward Olszewski, at the University of Arizona, will use three new technologies to make a factor of 10-30 advance in the number of stellar velocities measured per galaxy. The goal is no longer to weigh the dSph's, but to derive the distribution of mass, thus the distribution of the dark matter. While small steps have been taken towards that goal to date, with heroically collected samples of up to 200 stars, it is only withsubstantially larger samples that reasonable models will be distinguished from each other. Suchmapping of the mass within dSph galaxies is required to critically compare their dark-matter haloswith the many - sometimes contradictory - predictions of models of galaxy and large-scale structure formation in the Universe. These researchers will use a new telescope - the Magellan 6.5-meter telescope of Las Campanas Observatory in Chile - a new echelle spectrograph - the Magellan-Inamori-Kyocera Echelle (MIKE) spectrograph - and a new 256-fiber system to feed this spectrograph a large number of stars simultaneously. This instrumental combination will allow the collection of 750-1500 kinematic samples per galaxy. ***

AST 0205790OLSZEWSKIDWARF球形星系（DSPH）可能是宇宙中最小的系统，既包含暗物质和发光物质。如果可以收集足够的运动学数据来约束模型，则可以详细研究DSPHGALAXIES中的暗物质内容和分布。 密歇根大学的Mario Mateo博士和亚利桑那大学的Edward Olszewski博士将使用三种新技术在每个银河系测量的恒星速度数量上提前10-30倍。目的不再是权衡DSPH的权衡，而是得出质量的分布，从而导致暗物质的分布。尽管迄今为止，已经采取了小步骤朝着该目标迈出，但英雄收集的样本最多可列出200颗星，但只有更大的样本才能彼此区分合理的模型。需要对DSPH星系中的质量图进行批判性地比较其黑色卤素的卤素，其中许多（有时是矛盾的）预测了宇宙中星系模型和大规模结构形成的模型。这些研究人员将使用新的望远镜 - 智利的Las Campanas天文台的麦哲伦6.5米望远镜 - 新的梯形光谱仪-Magellan -Inamori -Kyocera Echelle（Mike）Echelle（Mike）Echelle（Mike）光谱仪，以及一个新的256-纤维系统，以使这张光谱仪同时摄取大量的星星。这种仪器组合将允许每个银河系收集750-1500的运动样品。 ***