The Formation of Loose Groups

松散团体的形成

基本信息

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

项目摘要

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. Pisanodr。 Pisano将在澳大利亚国家望远镜工厂作为国会议员杰出的博士后研究员进行研究计划。他的研究将重点放在宽松星系的HI特性上，以解决有争议的模型，以形成我们的银河系和其他更遥远的星系。大多数星系，包括我们自己的星系都居住在群体中，尽管人们对我们本地群体等宽松群体的许多特性相对较少了解。例如，尚不清楚宽松的星系群是否仍在组装，或者环境如何影响这些群体的成员。一些星系形成模型表明，宽松的组应存在数百个暗物质光环。也许在银河系周围看到的高速云与这些暗物质光环有关，是与当地群体形成相关的气态碎片。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组中。该研究计划将通过对宽松星系的HI和光学观察来检验这些假设，这些假设将在松散的组中寻找高速云的存在并检测低质量，富含气体的星系。这项研究是通过数学和物理科学局的多学科活动办公室资助的。***