From Galaxy Clustering to Galaxy Formation and Evolution

从星系团聚到星系形成和演化

• 批准号: 0907947
• 负责人: Idit Zehavi
• 金额: $ 33.26万
• 依托单位: Case Western Reserve University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0907947&HistoricalAwards=false
• 关键词: Galaxy; Clustering; Formation; Evolution

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Dr Zehavi will analyze and model the clustering of galaxies in large surveys such as the Sloan Digital Sky Survey (SDSS), to probe galaxy formation and the development of cosmic large-scale structure. She and others have shown that on small scales, dim red galaxies are more strongly clustered than brighter ones. This could be explained if the dim galaxies are satellites of more luminous galaxies, sharing their massive dark halos. Dr Zehavi and her team will test this hypothesis by examining much larger samples from the SDSS, and comparing the clustering properties of the dim red galaxies to those predicted for satellite dark halos by gravitational N-body simulations. The SDSS data will also be used to examine the distribution of satellite galaxies, comparing the observed anisotropic distribution with predictions from current models in which the satellites form in filaments of the cosmic web. She will use other surveys of more distant galaxies to examine how galaxy clustering has changed over the past 10 billion years of cosmic history. To do this, Dr Zehavi will construct a Halo Occupation Distribution model, which gives a statistical relation between the luminosity and appearance of a galaxy at a given time and the mass of its dark halo. The growth of dark halos can be followed in cosmological N-body simulations, so this model will provide a link between present-day galaxies and their probable precursors, billions of years earlier.A postdoctoral scholar will be trained by participating in the research; undergraduate students will also be involved. Dr Zehavi will continue to give public-outreach talks at local venues. She will partner with a local museum and planetarium to develop exhibits, and mentor undergraduates working as museum interns.

Zehavi博士将分析和模拟大型调查中的星系聚集，如斯隆数字巡天（SDSS），以探测星系的形成和宇宙大尺度结构的发展。 她和其他人已经证明，在小尺度上，暗淡的红色星系比明亮的星系更强烈地聚集在一起。 这可以解释，如果昏暗的星系是更明亮的星系的卫星，分享他们的巨大黑暗晕。 Zehavi博士和她的团队将通过检查SDSS中更大的样本来验证这一假设，并将昏暗红色星系的聚集特性与引力N体模拟预测的卫星暗晕进行比较。 SDSS数据还将用于研究卫星星系的分布，将观测到的各向异性分布与当前模型的预测进行比较，在当前模型中，卫星形成宇宙网的细丝。 她将利用其他对更遥远星系的调查来研究星系团在过去100亿年的宇宙历史中是如何变化的。为了做到这一点，Zehavi博士将构建一个Halo Occupation Distribution模型，该模型给出了给定时间星系的亮度和外观与其暗晕质量之间的统计关系。 暗晕的增长可以在宇宙学N体模拟中跟踪，因此该模型将提供当今星系与数十亿年前可能的前体之间的联系。一名博士后学者将通过参与研究进行培训;本科生也将参与其中。 Zehavi博士将继续在当地举行公众宣传讲座。 她将与当地博物馆和天文馆合作开发展品，并指导作为博物馆实习生的本科生。