RUI: A Wide-Angle H-alpha Survey of the Southern Hemisphere Sky

RUI：南半球天空的广角 H-alpha 巡天

• 批准号: 9529057
• 负责人: John Gaustad
• 金额: $ 5.36万
• 依托单位: Swarthmore College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-05-01 至 1999-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9529057&HistoricalAwards=false
• 关键词: RUI; Wide; Angle; alpha; Survey

9529057 Gaustad A wide-angle imaging survey of the southern sky at the frequency of the H-alpha emission line of Hydrogen at a wavelength of 656.3 nm will be carried out. The angular resolution of the observations will be about one arcminute, and to a sensitivity level of one Rayleigh, corresponding to an emission measure of 2 cm-6 pc, and to a brightness temperature for microwave free-free emission of 6 microKelvin at 30 Ghz. The system to be used to observe the radiation will be a Charge- Coupled Device (CCD), a commercial camera lens, and narrow-band interference filters, mounted on a robotic telescope. The robotic telescope will be deployed at the Cerro Tololo Inter-American Observatory in Chile. The project will require approximately one year of observing time. The results from the survey will allow accurate measurements of fluctuations in the Galactic free-free emission from Hydrogen at microwave wavelengths (or provide proof that these emissions are negligible). This emission must be subtracted from satellite or ground-based measurements of the cosmic microwave background to obtain the true microwave cosmic background fluctuations. The survey will produce detailed information on the structure of the diffuse, warm, ionized component of the interstellar medium, information which is necessary for understanding the physical properties of the interstellar gas. Participation by several undergraduate students in the research project will enhance their understanding of the nature of scientific research. ***

小行星9529057 将在波长为656.3纳米的氢的H-α发射线频率上对南部天空进行广角成像调查。 观测的角分辨率约为1角分，灵敏度为1瑞利，对应于2 cm-6 pc的发射测量，30 Ghz时微波自由发射的亮度温度为6微开尔文。 用于观测辐射的系统将是安装在机器人望远镜上的电荷耦合器件（CCD）、商业照相机透镜和窄带干涉滤光器。 机器人望远镜将部署在智利的Cerro Tololo美洲天文台。 该项目将需要大约一年的观测时间。 调查的结果将允许精确测量微波波长下氢的银河系自由-自由发射的波动（或提供证据证明这些发射可以忽略不计）。 这种辐射必须从卫星或地面测量的宇宙微波背景中减去，以获得真正的微波宇宙背景波动。 这次巡天将提供关于星际介质中弥漫的、温暖的、电离的成分的结构的详细资料，这些资料对于了解星际气体的物理性质是必要的。 几名本科生参与研究项目将增强他们对科学研究性质的理解。 ***