Cosmology with the Cosmic Background Imager

AST 0098734读数头Dr.加州理工学院的Anthony Readhead及其同事将继续使用宇宙背景成像仪（CBI）在3角分至0.5度的角尺度上对宇宙微波背景辐射（CMBR）进行观测。 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多极矩范围l=400至3000的CMBR的角功率谱。 另外一个计划将被执行，以测量由CMBR光子从星系团中的热电子散射引起的CMBR中的次级波动-Sunyaev-Zel'dovich效应。 CBI将对附近19个星团的完整样本进行观测，这些观测结果将与X射线观测结果相结合，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。这项工作利用最先进的仪器解决了科学的一个基本领域，预计将为我们理解宇宙的起源和演化做出重大贡献。 ***

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. ***