  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.
