CMB Polarization at Large Angular Scales: Data Analysis of the POLAR Experiment
CMB Polarization at Large Angular Scales: Data Analysis of the POLAR Experiment
复制标题
大角尺度 CMB 偏振：POLAR 实验的数据分析
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
U. Wisconsin
中科院分区：
文献类型：
--
作者：
C. O’Dell;B. Keating;A. D. Oliveira;Max Tegmark;Peter T. Timbie University of Massachusetts;Caltech;U. Pennsylvania;U. Wisconsin
宇宙微波背景（CMB）极化实验即将如潮水般涌现，这是由DASI和WMAP仪器近期探测到CMB极化所激发的，这些实验将面临许多针对极化的新分析任务。对于CMB极化数据集的分析，细节至关重要。基于此，我们详细介绍了POLAR实验的数据分析过程，该实验最近在大角度尺度上对宇宙微波背景辐射的极化给出了最严格的上限。我们讨论了数据选择过程、制图算法、偏移消除以及用于确定极化上限的似然分析。按照报告CMB斯托克斯参数的现代惯例，在95%置信度下，E型和B型极化的上限均为5.0微开尔文。最后，我们讨论了用于测试我们的分析技术以及探究实验基本局限性的模拟。
The coming flood of cosmic microwave background (CMB) polarization experiments, spurred by the recent detection of CMB polarization by the DASI and WMAP instruments, will be confronted by many new analysis tasks specific to polarization. For the analysis of CMB polarization data sets, the devil is truly in the details. With this in mind, we present details of the data analysis for the POLAR experiment, which recently led to the tightest upper limits on the polarization of the cosmic microwave background radiation at large angular scales. We discuss the data selection process, map-making algorithms, offset removal, and likelihood analysis which were used to find upper limits on the polarization. Stated using the modern convention for reporting CMB Stokes parameters, these limits are 5.0 ensuremath{mu}K on both E- and B-type polarization at 95% confidence. Finally, we discuss simulations used to test our analysis techniques and to probe the fundamental limitations of the experiment.