CAREER: Exploring the Invisible Universe With Milky Way Dwarfs and Streams

职业：利用银河系矮星和溪流探索看不见的宇宙

• 批准号: 1151462
• 负责人: Beth Willman
• 金额: $ 75.95万
• 依托单位: Haverford College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2017-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1151462&HistoricalAwards=false
• 关键词: CAREER; Exploring; Invisible; Universe; Milky

Dr. Willman will use Milky Way stellar streams and dwarf galaxies to study the Galaxy's dark matter sub-halos and formation history. She will implement a photometric technique to mitigate contamination from unresolved galaxies in Sloan Digital Sky survey and Dark Energy Survey point source catalogs. She will apply new techniques to optical (Sloan Digital Sky Survey, Dark Energy Survey) and infrared (UKIDSS) datasets to study known stellar streams with higher fidelity and to reveal the presence of previously unseen streams and dwarfs in previously unmapped Milky Way volume. The data are already publicly available for both the Sloan Digital Sky Survey and UKIDSS. The Dark Energy Survey is scheduled to begin survey operations in 2012. Dr. Willman will also use N-body and N-body + SPH simulations to explore a possible new method to "see" purely dark sub-halos. She will investigate the merging histories of the Milky Way's dwarf galaxies and possible observational signatures thereof. This work provides a direct approach to astronomically measure the properties of dark matter on the smallest possible sub-galactic scales - a major problem facing observational cosmology. It will also leave the field well-poised for the upcoming wide-field optical and infrared surveys.A postdoctoral researcher and undergraduate students will be trained as they participate in this research and in related public outreach. The postdoctoral researcher will also engage in closely mentored undergraduate teaching experiences at Haverford College. Dr. Willman will lead an undergraduate seminar in science diversity in Years 1, 3, and 5. Students and Dr. Willman will collaborate on developing Haverford's student-run Strawbridge Observatory public program. Numerous undergraduates will have the opportunity to participate in a student-led research program based on KPNO 0.9m telescope observations. Dr. Willman will also release star catalogs for the Sloan Digital Sky Survey and the Dark Energy Survey informed by broad-band photometry.

威尔曼博士将利用银河系恒星流和矮星系来研究银河系的暗物质子晕和形成历史。她将实施一种光度测量技术，以减轻斯隆数字巡天和暗能量巡天点源目录中未解决星系的污染。她将把新技术应用于光学（斯隆数字巡天，暗能量调查）和红外（UKIDSS）数据集，以更高的保真度研究已知的恒星流，并揭示以前未映射的银河系体积中以前看不见的流和矮星的存在。斯隆数字巡天和UKIDSS的数据已经公开。暗能量调查计划于2012年开始调查工作。Willman博士还将使用N-body和N-body + SPH模拟来探索一种可能的新方法，以“看到”纯粹的黑暗子晕。她将研究银河系矮星系的合并历史及其可能的观测特征。这项工作提供了一种直接的方法来天文测量暗物质的属性在最小的可能的亚星系尺度-一个主要的问题面临的观测宇宙学。这也将使该领域为即将到来的宽视场光学和红外测量做好准备。博士后研究人员和本科生将在参与这项研究和相关公共宣传时接受培训。 博士后研究员还将在哈弗福德学院从事密切指导的本科教学经验。Willman将在第1年，第3年和第5年领导科学多样性本科研讨会。学生和博士威尔曼将合作开发哈弗福德的学生运行的斯特劳布里奇天文台公共计划。许多本科生将有机会参加基于KPNO 0.9米望远镜观测的学生主导的研究计划。威尔曼博士还将发布星星目录的斯隆数字天空调查和暗能量调查通知宽带测光。