Improved Dark Energy Detection through the Polarization-assisted WMAP-NVSS ISW Correlation

Details Improved Dark Energy Detection through the Polarization-assisted WMAP-NVSS ISW Correlation Improved Dark Energy Detection through the Polarization-assisted WMAP-NVSS ISW Correlation

2010-10-04

arxiv.org/abs/1010.0578v1

Phys.Rev.D83:063001,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, 2 figures

Scientific paper

10.1103/PhysRevD.83.063001

Integrated Sachs-Wolfe (ISW) effect can be estimated by cross-correlating Cosmic Microwave Background (CMB) sky with tracers of the local matter distribution. At late cosmic time, the dark energy induced decay of gravitation potential generates a cross-correlation signal on large angular scales. The dominant noise are the intrinsic CMB anisotropies from the inflationary epoch. In this Letter we use CMB polarization to reduce this intrinsic noise. We cross-correlate the microwave sky observed by Wilkinson Microwave Anisotropy Probe (WMAP) with the radio source catalog compiled by NRAO VLA Sky Survey (NVSS) to study the efficiency of the noise suppression . We find that the error bars are reduced about 5-12 %, improving the statistical power.

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