The Formation of Loose Groups

松散团体的形成

• 批准号: 0104439
• 负责人: Daniel Pisano
• 金额: $ 19.55万
• 依托单位: Pisano Daniel J
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0104439&HistoricalAwards=false
• 关键词: Formation; Loose; Groups

MPS-0104439PI: Daniel J. PisanoDr. Pisano will carry out a program of research as an MPS Distinguished Research Postdoctoral Fellow at the Australian National Telescope Facility. His research will focus on the HI properties of loose groups of galaxies, in an effort to resolve controversial models for the formation of our Milky Way Galaxy and others more distant galaxies. Most galaxies, including our own, reside in groups, although many properties of loose groups, such as our own Local Group, are relatively poorly understood. It is not known whether loose groups of galaxies are still assembling, for example, or how the environment affects members of these groups. Some galaxy formation models suggest that hundreds of dark matter halos should exist in loose groups. Perhaps the high velocity clouds seen around the Milky Way are associated with these dark matter halos and are the gaseous debris associated with the formation of the Local Group. If these theories are correct, then the analogs of high velocity clouds and satellite galaxies should exist in other loose groups as well. This research program will test these hypotheses, with HI and optical observations of loose groups of galaxies, that will search for the presence of high velocity clouds in loose groups and detect low-mass, gas-rich galaxies. This research is funded through the Office of Multidisciplinary Activities in the Directorate for Mathematical and Physical Sciences.***

MPS-0104439PI：Daniel J. Pisano 博士。皮萨诺将作为 MPS 杰出研究博士后研究员在澳大利亚国家望远镜设施开展一项研究计划。 他的研究将集中于松散星系群的 HI 特性，努力解决银河系和其他更遥远星系形成的有争议的模型。 大多数星系，包括我们自己的星系，都居住在星系群中，尽管人们对松散星系团（例如我们自己的本星系群）的许多属性知之甚少。 例如，尚不清楚松散的星系群是否仍在聚集，或者环境如何影响这些星系群的成员。 一些星系形成模型表明，数百个暗物质晕应该以松散的形式存在。 也许银河系周围看到的高速云与这些暗物质晕有关，并且是与本星系团形成有关的气态碎片。 如果这些理论是正确的，那么高速云和卫星星系的类似物也应该存在于其他松散的星系团中。 该研究计划将通过对松散星系群的 HI 和光学观测来测试这些假设，从而寻找松散星系群中是否存在高速云，并探测低质量、富含气体的星系。这项研究由数学和物理科学局多学科活动办公室资助。***