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Chinese Science Bulletin

, Volume 56, Issue 1, pp 29–33

First Online: 02 February 2011Received: 25 September 2010Accepted: 11 October 2010


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.

Keywordscosmology cosmic microwave background data analysis This article is published with open access at

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Autor: Hao Liu - TiPei Li


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