Probing Large-Scale Structure via Millimeter-Wavelength Measurements of the Sunyaev-Zel'dovich Effect in Clusters of Galaxies

通过星系团中 Sunyaev-Zeldovich 效应的毫米波测量来探测大尺度结构

• 批准号: 9970797
• 负责人: Sarah Church
• 金额: $ 33.49万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-15 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9970797&HistoricalAwards=false
• 关键词: Probing; Large; Scale; Structure; via

The present day distribution of galaxies is inhomogeneous. The universe at the time of the cosmic microwave background (CNB) is isotropic and smooth. A critical problem in modern cosmology is the reconciliation of the two. The CMB provides an extremely uniform back light to the observable universe. When one views the CMB through a cluster of galaxies, the CMB spectrum is distorted because the CMB interacts with the hot, ionized plasma that is gravitationally bound in clusters of galaxies. This effect is known as the Sunyaev-Zel'dovitch effect.. The thermal and bulk velocities of the electrons in the hot plasma produce spectral distortions that can be only distinguished from one another by multi frequency observations at 100 to 300 GHz. Dr. Church is continuing a program of research that uses the Sunyaev-Zel'dovitch Infrared Experiment (SuZIE). This is a bolometric array receiver that observes at 143, 217, 350 GHz. The instrument is designed to measure the thermal and kinematic components of the SZ effect with high precision. Dr. Church is extending the sample of SZ derived peculiar velocities at z greater than or equal to 0.1 to a sample of 60, with an expected precision of 250-700 km/s per cluster; and also measuring the arcminute scale anisotropy of the CMB with a precision of 10 mK per 1.5' pixel over 0.5 sq degree, thus mapping out the CMB power spectrum from l = 1000 to 3500.***

今天的星系分布是不均匀的。 宇宙微波背景辐射（CNB）时的宇宙是各向同性和光滑的。 现代宇宙学的一个关键问题是两者的调和。 CMB为可观测的宇宙提供了极其均匀的背光。 当人们透过星系团观察CMB时，CMB光谱会被扭曲，因为CMB与星系团中引力束缚的热电离等离子体相互作用。 这种效应被称为Sunyaev-Zel'dovitch效应。 热等离子体中电子的热速度和体速度产生光谱失真，这些光谱失真只能通过在100至300 GHz的多频观测来区分。 丘奇博士正在继续一项使用Sunyaev-Zel'dovitch红外实验（SuZIE）的研究计划。 这是一个测辐射热阵列接收器，在143，217，350 GHz进行观测。 该仪器设计用于高精度测量SZ效应的热分量和运动分量。 Church博士正在将SZ导出的z大于或等于0.1的特殊速度的样本扩展到60的样本，预期每个星团的精度为250-700 km/s;并以每1.5'像素10 mK、0.5平方度的精度测量CMB的角分尺度各向异性，从而绘制出从l = 1000到3500的CMB功率谱。