Systematic Distortion in Cosmic Microwave Background Maps

Details Systematic Distortion in Cosmic Microwave Background Maps Systematic Distortion in Cosmic Microwave Background Maps

2008-09-24

arxiv.org/abs/0809.4160v2

Sci China G-Phy Mech Astron 52: 804-808 (2009)

Astronomy and Astrophysics

Astrophysics

accepted for publication in Sci China G-Phy Mech Astron

Scientific paper

10.1007/s11433-009-0116-z

To minimize instrumentally induced systematic errors, cosmic microwave background (CMB) anisotropy experiments measure temperature differences across the sky using paires of horn antennas, temperature map is recovered from temperature differences obtained in sky survey through a map-making procedure. To inspect and calibrate residual systematic errors in recovered temperature maps is important as most previous studies of cosmology are based on these maps. By analyzing pixel-ring couping and latitude dependence of CMB temperatures, we find notable systematic deviation from CMB Gaussianity in released Wilkinson Microwave Anisotropy Probe (WMAP) maps. The detected deviation is hard to explain by any process in the early universe and can not be ignored for a precision cosmology study.

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