Pseudo-Dipole Signal Removal from WMAP Data

Details Pseudo-Dipole Signal Removal from WMAP Data Pseudo-Dipole Signal Removal from WMAP Data

2010-05-13

arxiv.org/abs/1005.2352v3

Chinese Science Bulletin 2011, 56(1) 29-33

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

V3: using WMAP7 data

Scientific paper

10.1007/s11434-010-4222-0

It is discovered in our previous work that different observational systematics, e.g., errors of antenna pointing directions, asynchronous between the attitude and science data, can generate pseudo-dipole signal in full-sky maps of the cosmic microwave background (CMB) anisotropy published by The Wilkinson Microwave Anisotropy Probe (WMAP) team. Now the antenna sidelobe response to the Doppler signal is found to be able to produce similar effect as well. In this work, independent to the sources, we uniformly model the pseudo-dipole signal and remove it from published WMAP7 CMB maps by model fitting. The result demonstrates that most of the released WMAP CMB quadrupole is artificial.

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