Bright Field Galaxies and their Dark Matter Halos

明场星系及其暗物质晕

• 批准号: 0708468
• 负责人: Tereasa Brainerd
• 金额: --
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-15 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0708468&HistoricalAwards=false
• 关键词: Bright; Field; Galaxies; their; Dark

AST-0708468BrainerdAlthough it is generally accepted that massive dark matter halos surround all large, bright galaxies, many of the basic properties of galaxy-sized dark matter halos remain poorly constrained. This project focuses on using small, faint satellite galaxies, orbiting within the gravitational potentials of large, bright field galaxies, to obtain a substantial improvement over the current halo constraints. The research will use a combination of theory, archival and new observations, and numerical datasets, to address a) the best halo virial mass estimator, b) how best to measure the velocity dispersion of satellite galaxies, c) the dependence of the mass-to-light ratio on luminosity, and whether this differs for early- and late-type galaxies, d) whether the halos of late-type galaxies are fundamentally different from those of early-type galaxies, and e) whether the angular momentum of a disk galaxy closely correlates with the net angular momentum of its halo.The principal investigator will participate in Lowell Observatory's successful outreach program, targeting fifth through eighth grade students at Navajo and Hopi Nation Schools. This teacher-astronomer partnership is a significant commitment of time, including classroom visits, timed to coincide with observing runs, and an extended field trip for the students. The research will contribute to the professional development of a graduate student. All of the genuine and simulated data, and the software used, will be publicly available.

AST-0708468BrainerDalerdalerdalerdalerdal，尽管大量的暗物质光环围绕着所有大而明亮的星系，但星系尺寸的暗物质光环的许多基本特性仍然受到良好的约束。 该项目的重点是使用大型卫星星系，在大型明亮的田间星系的重力电位内绕行，以获得比当前光晕约束的实质性改进。 The research will use a combination of theory, archival and new observations, and numerical datasets, to address a) the best halo virial mass estimator, b) how best to measure the velocity dispersion of satellite galaxies, c) the dependence of the mass-to-light ratio on luminosity, and whether this differs for early- and late-type galaxies, d) whether the halos of late-type galaxies are fundamentally与早期类型星系的不同，以及e）磁盘星系的角动力是否与其光环的净角动量密切相关。 这种教师宣传的伙伴关系是时间的重大承诺，包括课堂访问，与观察跑步相吻合的时间，以及为学生进行的扩展实地考察。 这项研究将有助于研究生的专业发展。 所有真实和模拟的数据以及所使用的软件将公开使用。