标题： WMAP 数据中的观测数目相关性 显示英文标题

标题： Observation number correlation in WMAP data

摘要： 威尔金森微波各向异性探测器（WMAP）任务获得的宇宙微波背景（CMB）温度的大尺度非高斯模式与观测次数分布特征之间存在显著相似性。 受此相似性的启发，在本工作中我们检查了WMAP数据中像素温度t与观测次数N之间的相关性。发现了观测次数不平衡导致的系统效应以及幅度、分布非高斯性和南北不对称性方面的显著t-N相关性。 我们的结果显示，对于基于WMAP观测的精确宇宙学研究，必须进一步仔细研究释放的WMAP温度图的观测效应。 显示英文摘要

摘要： A remarkable similarity between the large-scale non-Gaussian pattern of cosmic microwave background (CMB) temperatures obtained by Wilkinson Microwave Anisotropy Probe (WMAP) mission and the distribution feature of observation numbers is noted. Motivated from such a similarity, in this work we check the WMAP data for the correlation between pixel temperature t and observation number N. Systematic effect of imbalance differential observation and significant t-N correlation in magnitude, distribution non-Gaussianity and north-south asymmetry are found. Our results indicate that, for precision cosmology study based on WMAP observations, the observation effect on released WMAP temperature maps has to be further carefully studied.