Phase Cross-Correlation of the Wilkinson Microwave Anisotropy Probe Internal Linear Combination Map and Foregrounds

Abstract

We present a circular cross-correlation test for the phases of the Internal Linear Combination (ILC) map and the Wilkinson Microwave Anisotropy Probe foregrounds for all K-W frequency bands at the range of multipoles l ≤ 50. We have found significant deviations from the expected Poissonian statistics for the ILC and foreground phases. Our analysis shows that the low multipole range of the ILC power spectrum contains some residue of the foregrounds.