Pseudo-dipole signal removal from WMAP data

• Published in: Chinese science bulletin Vol. 56; no. 1; pp. 29 - 33
• Main Authors: Liu, Hao, Li, TiPei
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer-Verlag 2011; SP Science China Press
• Subjects: Anisotropy; Antennas; Chemistry/Food Science; Cosmic microwave background; Doppler effect; Earth Sciences; electronic equipment; Engineering; equations; Humanities and Social Sciences; Life Sciences; mathematical models; microwave radiation; Microwaves; multidisciplinary; Physics; Quadrupoles; Science; Science (multidisciplinary); Sidelobes; WMAP; 信号产生; 大肠杆菌; 天线旁瓣; 威尔金森微波各向异性探测器; 宇宙微波背景辐射; 数据信号; cosmic microwave background; data analysis; cosmology
• ISSN: 1001-6538; 1861-9541; 1861-9541
• DOI: 10.1007/s11434-010-4222-0

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.