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.

马特奥博士和奥尔谢夫斯基博士将使用马特奥博士建造的麦哲伦望远镜上的摄谱仪来测量矮星系内恒星的运动。 这些最不发光的星系似乎含有比恒星更多的质量：我们观察到这些恒星移动得如此之快，如果没有看不见的暗物质的额外引力，它们就会逃离星系。 通过对恒星运动的仔细研究，该小组将改进对附近矮星系总质量的测量，并测试它们是否被邻近星系的引力拉开。 在更遥远的星系中，他们将测量周围球状星团的运动，以估计星系的质量，从而估计其暗物质的质量。 该小组将与统计学家合作分析和解释他们的结果。这项工作的结果将检验星系形成的理论，其中许多理论预测星系必须超过最小质量才能继续形成恒星。 学生在参与研究时将接受培训。 Mateo 博士和 Olszewski 博士都将就他们在当地社区的工作发表公开演讲。通过在美国亚利桑那州的一个项目，奥尔谢夫斯基博士将继续与小学教师一起工作，举办明星派对并参观斯图尔特天文台望远镜。