Collaborative Research: Probing Galaxy and Cluster Halos Using Dwarf Galaxies

合作研究：利用矮星系探测星系和星团晕

• 批准号: 0808043
• 负责人: Mario Mateo
• 金额: $ 46.92万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 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: 2008-07-01 至 2014-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0808043&HistoricalAwards=false
• 关键词: Collaborative; Research; Probing; Galaxy; Cluster

Drs Mateo and Olszewski will measure the motions of stars within dwarf galaxies, using a spectrograph at the Magellan telescope built by Dr. Mateo. These least-luminous of the galaxies appear to contain far more mass than is present as stars: we observe those stars to be moving so rapidly that they would escape from the galaxy if not for the additional gravitational pull of unseen dark matter. By careful studies of stellar motion, the group will improve measurements of the total mass present in nearby dwarf galaxies, and test whether they are being pulled apart by gravitational forces from neighbor galaxies. In more distant galaxies, they will measure motions of the surrounding globular star clusters to estimate the mass of the galaxy and hence of its dark matter. The group will collaborate with statisticians to analyze and interpret their results. The results of this work will test theories of galaxy formation, many of which predict that a galaxy must exceed a minimum mass in order to continue making stars. Students will be trained as they participate in the research. Both Dr Mateo and Dr. Olszewski will present public lectures on their work in their local communities. Through a program at U. Arizona, Dr. Olszewski will continue his work with elementary-school teachers, with star parties and visits to the Steward Observatory telescopes.

Mateo和Olszewski博士将使用Mateo博士建造的麦哲伦望远镜的光谱仪，测量矮星系中恒星的运动。 这些最小的星系中似乎包含的质量远远超过恒星的质量：我们观察到那些恒星的移动速度如此之快，以至于如果不是因为不看到看不见的暗物质的额外的引力，它们就会逃离星系。 通过对恒星运动的仔细研究，该组将改善附近矮星系中存在的总质量的测量，并测试它们是否被邻居星系的引力拉开。 在更遥远的星系中，它们将测量周围球形恒星簇的运动，以估计星系的质量以及其暗物质的质量。 该小组将与统计学家合作分析和解释其结果。这项工作的结果将测试星系形成的理论，其中许多预测星系必须超过最小质量才能继续制作恒星。 学生将在参加研究时接受培训。 Mateo博士和Olszewski博士都将就其在当地社区的工作进行公开演讲。通过在美国亚利桑那州的一项计划，Olszewski博士将继续与小学老师一起工作，并通过明星派对和参观管家天文台望远镜。