Cosmology with the Cosmic Background Imager

AST 0098734 readheaddr。加州理工学院的Anthony Readhead和他的同事将继续使用宇宙背景成像仪（CBI）在3角分到0.5度的角度尺度上观测宇宙微波背景辐射（CMBR）。CBI位于智利安第斯山脉，海拔5000米。CBI项目的主要目标是测量CMBR在多极矩范围l=400至3000的角功率谱。一个额外的项目将被执行来测量宇宙微波背景辐射的二次波动，这是由宇宙微波背景辐射的光子从星系团中的热电子散射而引起的——Sunyaev-Zel'dovich效应。CBI将对19个附近星团的完整样本进行观测，这些观测结果将与x射线观测相结合，以10%的精度确定哈勃常数。该团队包括研究生和博士后研究员。这项工作用最先进的仪器解决了科学的一个基础领域，预计将对我们对宇宙起源和演化的理解做出重大贡献。＊＊＊

AST 0098734ReadheadDr. Anthony Readhead and colleagues at the California Institute of Technology will continue to use the Cosmic Background Imager (CBI) to make observations of the Cosmic Microwave Background Radiation (CMBR) on angular scales of 3 arc minutes to 0.5 degrees. The CBI is located in the Chilean Andes at an altitude of 5000 meters. The prime objective of the CBI project is to measure the angular power spectrum of the CMBR over the multipole moment range l=400 to 3000. An additional program will be carried out to measure secondary fluctuations in the CMBR caused by the scattering of the CMBR photons off the hot electrons in clusters of galaxies - the Sunyaev-Zel'dovich Effect. A complete sample of 19 nearby clusters will be observed with the CBI, and these observations will be combined with X-ray observations to determine the Hubble Constant with 10% accuracy. The team includes graduate students and post-doctoral fellows. This work addresses a fundamental area of science with a state-of-the-art instrument and is expected to make a significant contribution to our understanding of the origin and evolution of the Universe. ***