Observation number correlation in WMAP data
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.
Keywords
Cite
@article{arxiv.0905.0075,
title = {Observation number correlation in WMAP data},
author = {Ti-Pei Li and Hao Liu and Li-Ming Song and Shao-Lin Xiong and Jian-Yin Nie},
journal= {arXiv preprint arXiv:0905.0075},
year = {2009}
}
Comments
accepted for publication in MNRAS