1745-3933/asset/olbannerleft.gif?v=1&s=fffe1e238d5b0db7645deede2efb491aa124f640)
1745-3933/asset/olbannerright.gif?v=1&s=f6a34f2c5825c97ccab4ac0d75dd08dedbecdd16)
Cross-correlation of WISE galaxies with the cosmic microwave background
Article first published online: 16 MAR 2012
DOI: 10.1111/j.1745-3933.2012.01240.x
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Issue
Monthly Notices of the Royal Astronomical Society: Letters
Volume 422, Issue 1, pages L77–L81, May 2012
Additional Information
How to Cite
Goto, T., Szapudi, I. and Granett, B. R. (2012), Cross-correlation of WISE galaxies with the cosmic microwave background. Monthly Notices of the Royal Astronomical Society: Letters, 422: L77–L81. doi: 10.1111/j.1745-3933.2012.01240.x
Publication History
- Issue published online: 19 APR 2012
- Article first published online: 16 MAR 2012
- Accepted 2012 February 16. Received 2012 February 13; in original form 2011 July 26
- Abstract
- Article
- References
- Cited By
Keywords:
- cosmic background radiation;
- dark energy;
- large scale structure of the Universe
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 ∼13 000 deg2 with a median redshift of z= 0.15. Cross-power spectra show correlations between the two data sets with no discernible dependence on the WMAPQ, V and W frequency bands. We interpret these results in terms of the integrated Sachs–Wolfe (ISW) effect: for the |b| > 20° sample at l= 6–87, we measure the amplitude (normalized to be 1 for vanilla Λ cold dark matter expectation) of the signal to be 3.4 ± 1.1, i.e. 3.1σ 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.