Pseudo-dipole signal removal from WMAP data  

作　　者：LIU Hao LI TiPei 

机构地区：[1]Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]Department of Physics and Center for Astrophysics,Tsinghua University,Beijing 100084,China [3]Department of Engineering Physics and Center for Astrophysics,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Science Bulletin》2011年第1期29-33,共5页

基　　金：supported by the National Natural Science Foundation of China (11033003);National Basic Research Program of China (2009CB824800);the CAS project (KJCX2-YW-T03)

摘　　要：We have discovered in our previous work that different observational systematics,e.g.errors from antenna pointing directions or an asynchronism between the attitude and science data may generate a pseudo-dipole signal in the full-sky maps of the cosmic microwave background (CMB) anisotropy that have been published by the Wilkinson Microwave Anisotropy Probe (WMAP) team.We have found that the antenna sidelobe response to the Doppler signal produces a similar effect.In this work,independent from the sources,we have uniformly modeled the pseudo-dipole signal and have removed it from the published WMAP7 CMB maps by model fitting.The result demonstrates that the released WMAP CMB quadrupole is almost completely artificial.We have discovered in our previous work that different observational systematics, e.g. errors from antenna pointing directions or an asynchronism between the attitude and science data may generate a pseudo-dipole signal in the full-sky maps of the cosmic microwave background (CMB) anisotropy that have been published by the Wilkinson Microwave Anisotropy Probe (WMAP) team. We have found that the antenna sidelobe response to the Doppler signal produces a similar effect. In this work, independent from the sources, we have uniformly modeled the pseudo-dipole signal and have removed it from the published WMAP7 CMB maps by model fitting. The result demonstrates that the released WMAP CMB quadrupole is almost completely artificial.

关 键 词：威尔金森微波各向异性探测器 数据信号 WMAP 偶极 宇宙微波背景辐射 天线旁瓣 大肠杆菌 信号产生 

分 类 号：O572.11[理学—粒子物理与原子核物理]