HI in the Local Universe

本地宇宙中的 HI

• 批准号: 0307661
• 负责人: Riccardo Giovanelli
• 金额: $ 44.86万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-06-01 至 2007-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0307661&HistoricalAwards=false
• 关键词: HI; Local; Universe

AST-0307661GiovanelliFor over half a century, the 21cm line of neutral hydrogen (HI) has been one of the main observational tools for galactic studies and cosmology. It has been used with ever-increasing sensitivity and resolution to investigate the structure of our own Galaxy and of other disk systems, their interactions with other galaxies, the large-scale structure of the Universe, and the physical conditions of high redshift systems. The recent evolution of 21 cm detectors, spectrometers and multi-feed systems has dramatically expanded both the accessible volume of parameter space and our ability to sample it quickly. The new seven-feed array for the Arecibo telescope enables it to study the HI Universe to unprecedented volumes and low mass levels.The first part of this research will explore the faint end of the HI mass function, and act as a pilot for the second part, which will carry out, develop the necessary analysis tools for, and process and make publicly accessible the products of, (a) a fast survey of the Arecibo HI sky, (b) a medium-deep survey of the Virgo cluster of galaxies, and (c) a deep extragalactic HI survey in the Zone of Avoidance, all using the Arecibo feed array system. All three surveys lend themselves to synergistic coordination with several different projects, not just the present ones, including studies of Milky Way structure and high velocity clouds, a pulsar search, and the detection of radio continuum transients.The software tools and data products will be made available to the community, and the research work will provide fertile ground for the training of a new generation of US-based single-dish radio astronomers.

半个多世纪以来，中性氢（HI）的21厘米谱线一直是银河系研究和宇宙学的主要观测工具之一。 它已被用于研究我们自己的银河系和其他盘系统的结构，它们与其他星系的相互作用，宇宙的大尺度结构，以及高红移系统的物理条件。 21厘米探测器，光谱仪和多馈系统的最新发展显着扩大了参数空间的可访问量和我们快速采样的能力。 阿雷西博望远镜的新的七馈阵使它能够研究HI宇宙到前所未有的体积和低质量水平，这项研究的第一部分将探索HI质量函数的微弱端，并作为第二部分的试点，第二部分将执行、开发必要的分析工具，并处理和公开提供以下产品：（a）对阿雷西博HI天空的快速调查，（B）室女座星系团的中深调查，和（c）在回避区的深河外HI调查，都使用阿雷西博馈电阵列系统。 这三项调查都有助于与几个不同的项目进行协同协调，而不仅仅是目前的项目，包括研究银河系结构和高速云、脉冲星搜索和探测无线电连续谱瞬变。这项研究工作将为培养美国新一代单碟射电天文学家提供肥沃的土壤。