Cross-correlation of WISE Galaxies with the Cosmic Microwave Background
Abstract
We estimated the cross-power spectra of a galaxy sample from the Wide-field Infrared Survey Explorer (WISE) survey with the 7-year Wilkinson Microwave Anisotropy Probe (WMAP) temperature anisotropy maps. A conservatively-selected galaxy sample covers ~13000sq.deg, with a median redshift of z=0.15. Cross-power spectra show correlations between the two data sets with no discernible dependence on the WMAP Q, V and W frequency bands. We interpret these results in terms of the the Integrated Sachs-Wolfe (ISW) effect: for the |b|>20 deg sample at l=6-87, we measure the amplitude (normalized to be 1 for vanilla LambdaCDM expectation) of the signal to be 3.4+-1.1, i.e., 3.1 sigma detection. We discuss other possibilities, but at face value, the detection of the linear ISW effect in a flat universe is caused by large scale decaying potentials, a sign of accelerated expansion driven by Dark Energy.
Keywords
Cite
@article{arxiv.1202.5306,
title = {Cross-correlation of WISE Galaxies with the Cosmic Microwave Background},
author = {Tomotsugu Goto and Istvan Szapudi and Benjamin R. Granett},
journal= {arXiv preprint arXiv:1202.5306},
year = {2015}
}
Comments
5 pages, 5 figures. Accepted for publication in MNRAS