Cross-Correlation analysis of WMAP and EGRET in Wavelet Space

Details Cross-Correlation analysis of WMAP and EGRET in Wavelet Space Cross-Correlation analysis of WMAP and EGRET in Wavelet Space

2005-11-18

arxiv.org/abs/astro-ph/0511550v1

Astrophys.J.636:L1-L4,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 7 figures; accepted for publication in ApJL

Scientific paper

10.1086/499804

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 $15^{\circ}$ 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.

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