Detection of the ISW effect and corresponding dark energy constraints

Details Detection of the ISW effect and corresponding dark energy constraints Detection of the ISW effect and corresponding dark energy constraints

2006-05-04

arxiv.org/abs/astro-ph/0605122v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, Proceedings of XLIst Rencontres de Moriond

Scientific paper

10.1111/j.1365-2966.2007.11505.x

Using a directional spherical wavelet analysis we detect the integrated Sachs-Wolfe (ISW) effect, indicated by a positive correlation between the Wilkinson Microwave Anisotropy Probe (WMAP) and NRAO VLA Sky Survey (NVSS) data, at the 3.9 sigma level. In a flat universe the detection of the ISW effect provides direct and independent evidence for dark energy. Moreover, we use our detection to constrain the dark energy density Omega_Lambda. We obtain estimates for Omega_Lambda consistent with other analysis techniques and data sets and rule out a zero cosmological constant at greater than 99% significance.

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