Cross-correlation of WMAP7 and the WISE full data release

Abstract

We measured the cross-correlation of the Wilkinson Microwave Anisotropy Probe (WMAP) 7-year temperature map and the full sky data release of the Wide-field Infrared Survey Explorer galaxy map. Using careful map-making and masking techniques we find a positive crosscorrelation signal. The results are fully consistent with a λCDM universe, although not statistically significant. Our findings are robust against changing the Galactic latitude cut from |b| > 10° to |b| > 20° and no colour dependence was detected when we used WMAP Q, V or W maps.We confirm higher significance correlations found in the preliminary data release. The change in significance is consistent with cosmic variance. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society