High Resolution Observations of the Cosmic Microwave Background (CMB) with Arcminute Cosmology Bolometer Array Receiver (ACBAR)

使用弧分宇宙学测辐射热计阵列接收器 (ACBAR) 对宇宙微波背景 (CMB) 进行高分辨率观测

• 批准号: 0232009
• 负责人: William Holzapfel
• 金额: $ 90.59万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-05-01 至 2007-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0232009&HistoricalAwards=false
• 关键词: Resolution; Observations; Cosmic; Microwave; Background

This proposal seeks continued support for observations with the Arcminute Cosmology Bolometer Array Receiver (ACBAR). ACBAR is a 16 element 230-mK bolometer receiver designed to produce high resolution images of the CMB in three mm wavelength bands. Mounted on the 2.1m Viper telescope at the South Pole, ACBAR has sensitivity that rivals balloon-borne experiments and angular resolution that they cannot hope to achieve. Making full use of the excellent atmospheric conditions in the Austral winter at the South Pole, ACBAR is producing images of the Cosmic Microwave Background (CMB) radiation with sensitivity and resolution that exceed the capabilities of even the proposed Planck satellite. Observations of the CMB provide a unique window to the early Universe; these data play a key role in the transformation of Cosmology to a precise science. In particular, small angular scale observations of the CMB are a new frontier about which comparatively little is known. On these angular scales, contributions from secondary anisotropies introduced by intervening structure are expected to become dominant. For example, the scattering of photons by hot gas bound to clusters of galaxies results in a spectral distortion of the CMB known as the Sunyeav-Zeldovich (SZ) effect. Observations of the SZ effect can provide important new constraints on theories of the growth of Universe's structure. The unique capabilities of ACBAR allow it to address a broad range of science focused on measuring the primary and secondary anisotropies of the CMB. ACBAR was deployed to the South Pole in December 2000 and has been operating since. The second half of the winter of 2003 and the entire 2004 season will be dedicated to observations with ACBAR. The requested 18 months of support for observations with ACBAR and analysis of the resulting data will help to realize the full potential of this uniquely powerful instrument for the study of cosmology. The four institutions supported by this proposal will continue to collaborate in the maintenance and operation of ACBAR and Viper, and participate in the analysis of the data. The results from ACBAR will serve as a vital complement to the large-scale MAP spacecraft dataset, and provide an essential check of the fine-scale excess power reported by the single frequency BIMA and CBI experiments. The novel instrumentation, observation techniques, and analysis developed for ACBAR are generally applicable to future ground based millimeter astronomy experiments. This project has provided hands on research experience to more than seven undergraduate students and will result in the theses of four graduate students.

该提案寻求继续支持使用弧分钟宇宙学测辐射热仪阵列接收器（ACBAR）进行观测。ACBAR是一个16单元230-mK测辐射热计接收器，设计用于在3毫米波段产生CMB的高分辨率图像。ACBAR安装在南极2.1米长的毒蛇望远镜上，其灵敏度可与气球实验相媲美，角分辨率也是他们无法实现的。ACBAR充分利用南极冬季的良好大气条件，正在制作宇宙微波背景辐射图像，其灵敏度和分辨率甚至超过了拟议的普朗克卫星的能力。CMB的观测为早期宇宙提供了一个独特的窗口;这些数据在宇宙学向精确科学的转变中发挥了关键作用。特别是，小角度尺度观测的CMB是一个新的前沿，相对知之甚少。在这些角度尺度上，由介入结构引入的二次各向异性的贡献预计将占主导地位。例如，光子被束缚在星系团中的热气体散射，导致宇宙微波背景辐射的光谱失真，称为Sunyeav-Zeldovich（SZ）效应。对SZ效应的观测可以为宇宙结构的增长理论提供重要的新约束。ACBAR的独特功能使其能够解决广泛的科学问题，重点是测量CMB的初级和次级各向异性。ACBAR于2000年12月部署到南极，并一直在运作。2003年冬季的下半个月和2004年整个季节将专门用于ACBAR的观测。所要求的18个月对ACBAR观测的支持和对所得数据的分析将有助于实现这一独特的强大仪器在宇宙学研究中的全部潜力。该提案支持的四个机构将继续在ACBAR和Viper的维护和操作方面进行合作，并参与数据分析。来自ACBAR的结果将作为大规模MAP航天器数据集的重要补充，并提供对单频比马和CBI实验报告的精细尺度过量功率的必要检查。新的仪器，观测技术和分析开发的ACBAR一般适用于未来的地基毫米天文学实验。该项目为七名以上的本科生提供了实践研究经验，并将产生四名研究生的论文。