Exploring Galaxy Evolution and Missing Satellites with ALMA and Gravitational Lensing

利用 ALMA 和引力透镜探索星系演化和失踪卫星

• 批准号: 1312950
• 负责人: Daniel Marrone
• 金额: $ 54.09万
• 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: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1312950&HistoricalAwards=false
• 关键词: Exploring; Galaxy; Evolution; Missing; Satellites

A significant fraction of the energy in the universe has been absorbed and re-emitted by dust, in dusty star-forming galaxies (DSFGs). Most of the star formation in the universe at cosmological redshifts between 2 and 3 may have taken place in such galaxies and emitted no visible or ultraviolet light because of dust obscuration. Using the NSF- and DOE-funded South Pole Telescope (SPT), the proposing team has identified approximately 100 bright DSFGs, all of which are magnified and brightened by gravitational lensing. They now intend to use the Atacama Large Millimeter/Submillimeter Array (ALMA) to observe these galaxies, obtaining spectroscopic redshifts, measuring elemental abundances, and inferring the distribution of dark matter. The goals are to determine the distribution of DSFGs in redshift, the physical conditions in their interstellar media, and the mass function of dark matter substructure. As a broader impact, the proposers intend to develop new interferometric analysis tools that incorporate self-calibration as a modeled uncertainty for gravitationally lensed objects. The project will support the work of two graduate students, and the PI will conduct outreach presentations and develop undergraduate laboratory exercises on interferometry.

尘土形成星系（DSFG），尘埃吸收并重新装饰了宇宙中的很大一部分。 宇宙中的大多数恒星形成在2至3之间的宇宙红移可能发生在此类星系中，并且由于灰尘的遮挡而没有发出可见或紫外线。提出的团队使用了NSF和DOE资助的南极望远镜（SPT）确定了大约100个明亮的DSFG，所有这些DSFG被重力镜头放大和更亮。他们现在打算使用Atacama大毫米/亚毫米阵列（ALMA）观察这些星系，获得光谱红移，测量元素丰度并推断暗物质的分布。目标是确定DSFG在红移，星际介质中的物理条件以及暗物质子结构的质量功能的分布。作为更广泛的影响，提案者打算开发新的干涉分析工具，将自校准作为重力镜头对象的建模不确定性。该项目将支持两名研究生的工作，PI将进行外展演讲，并在干涉法上开发本科实验室练习。