Observation number correlation in WMAP data
Ti-Pei Li, Hao Liu, Li-Ming Song, Shao-Lin Xiong, Jian-Yin Nie
TL;DR
This paper investigates the correlation between pixel temperature and observation number in WMAP data, revealing systematic effects and non-Gaussian features that impact cosmological analyses.
Contribution
It identifies and analyzes the correlation between observation number and temperature in WMAP data, highlighting potential systematic effects.
Findings
Significant t-N correlation in WMAP data
Detection of non-Gaussianity and asymmetry related to observation number
Implication of observation effects on cosmological conclusions
Abstract
A remarkable similarity between the large-scale non-Gaussian pattern of cosmic microwave background (CMB) temperatures obtained by Wilkinson Microwave Anisotropy Probe (WMAP) mission and the distribution feature of observation numbers is noted. Motivated from such a similarity, in this work we check the WMAP data for the correlation between pixel temperature t and observation number N. Systematic effect of imbalance differential observation and significant t-N correlation in magnitude, distribution non-Gaussianity and north-south asymmetry are found. Our results indicate that, for precision cosmology study based on WMAP observations, the observation effect on released WMAP temperature maps has to be further carefully studied.
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