Pseudo-Dipole Signal Removal from WMAP Data

Abstract

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.

V3: using WMAP7 data

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Cited by in corpus (6)

• Observational Scan Induced Artificial CMB Anisotropy
• On the suspected timing-offset-induced calibration error in the Wilkinson microwave anisotropy probe time-ordered data
• Dark Energy Cosmology with the Alternative Cosmic Microwave Background Data
• Constructing a Robust Universe with Attraction-Repulsion Coupling and Energy Conservation
• Diagnosing Timing Error in WMAP Data
• Missing completely of CMB quadrupole in WMAP data