Cross-Correlation analysis of WMAP and EGRET in Wavelet Space
Abstract
We cross correlate the Wilkinson Microwave Anisotropy Probe (WMAP) first year data and the diffuse gamma-ray intensity maps from the Energetic Gamma Ray Experiment Telescope (EGRET) using spherical wavelet approaches. Correlations at 99.7% significance level have been detected, at scales around in the WMAP foreground cleaned W-band and Q-band maps, based on data from regions that are outside the most conservative WMAP foreground mask; no significant correlation is found with the Tegmark cleaned map. The detected correlation is most likely of Galactic origin, and thus can help us probing the origins of possible Galactic foreground residuals and ultimately removing them from measured microwave sky maps.
Keywords
Cite
@article{arxiv.astro-ph/0511550,
title = {Cross-Correlation analysis of WMAP and EGRET in Wavelet Space},
author = {Xin Liu and Shuang Nan Zhang},
journal= {arXiv preprint arXiv:astro-ph/0511550},
year = {2009}
}
Comments
4 pages, 7 figures; accepted for publication in ApJL