Halo Substructure: Clues to the Merger History of the Milky Way

光环子结构：银河系合并历史的线索

• 批准号: 0507364
• 负责人: Robert Zinn
• 金额: $ 35.97万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0507364&HistoricalAwards=false
• 关键词: Halo; Substructure; Clues; Merger; History

AST-0507364INSTITUTION: Yale UniversityPI: Robert ZinnTITLE: Halo Substructure - Clues to the Merger History of the Milky WayABSTRACTDr. Robert Zinn, of Yale University, will undertake a program to complete three surveys, using RR Lyrae stars, to probe Galactic halo substructure. One survey will probe roughly twice the volume of the halo to the same ~60 kpc distance from the Sun as the first QUEST survey. A second survey, the Palomar-QUEST survey, will probe a significantly greater volume to a distance of roughly 100 kpc. The third survey is directed toward a dwarf galaxy in Canis Major that appears to be undergoing tidal disruption. Dr. Zinn will also undertake spectroscopic observations of the substructures detected by these surveys to establish if the stars are moving groups, to search for moving groups where there is no obvious substructure, and to measure more precisely the properties of the stream from the Sagittarius dwarf galaxy, which has the potential of constraining the distribution of dark matter in the halo. The primary broader impact of the research is in the areas of graduate and undergraduate student education and international collaboration. Dr. Zinn also participates in public outreach activities, including lectures to adults and Boy Scouts, as well as visits to elementary and secondary school classrooms.

AST-0507364调查：耶鲁大学PI：Robert ZinnTitle：Halo子结构-牛奶公司合并历史的线索。耶鲁大学的罗伯特·津恩将开展一项计划，利用天琴座RR恒星完成三项调查，以探测银河晕亚结构。其中一次探测将探测到大约两倍于第一次探测的光晕体积，距离太阳的距离约为60kpc。第二项调查，Palomar-Quest调查，将探测更大的体积，距离约100kpc。第三项调查针对的是位于大犬座的一个矮星系，该星系似乎正在经历潮汐破坏。津恩博士还将对这些观测探测到的子结构进行光谱观测，以确定恒星是否在移动星团，在没有明显子结构的地方搜索移动星团，并更准确地测量来自人马座矮星系的气流的性质，该星系可能会限制暗物质在光晕中的分布。这项研究的主要更广泛影响是在研究生和本科生教育以及国际合作领域。Zinn博士还参与公共宣传活动，包括给成年人和童子军讲课，以及参观小学和中学的教室。