Measurement of the gravitational potential evolution from the cross-correlation between WMAP and the APM Galaxy survey

Details Measurement of the gravitational potential evolution from the cross-correlation between WMAP and the APM Galaxy survey Measurement of the gravitational potential evolution from the cross-correlation between WMAP and the APM Galaxy survey

2003-05-26

arxiv.org/abs/astro-ph/0305468v5

Mon.Not.Roy.Astron.Soc.350:L37-L41,2004

Astronomy and Astrophysics

Astrophysics

Matches version accepted for publication in MNRAS Letters

Scientific paper

10.1111/j.1365-2966.2004.07837.x

Models with late time cosmic acceleration, such as the Lambda-dominated CDM model, predict a freeze out for the growth of linear gravitational potential at moderate redshift z<1, what can be observed as temperature anisotropies in the CMB: the so called integrated Sachs-Wolfe (ISW) effect. We present a direct measurement of the ISW effect based on the angular cross-correlation function, w_{TG}, of CMB temperature anisotropies and dark-matter fluctuations traced by galaxies. We cross-correlate the first-year WMAP data in combination with the APM Galaxy survey. On the largest scales, theta = 4-10 deg, we detect a non-vanishing cross-correlation at 98.8 % significance level, with a 1-sigma error of w_{TG} = 0.35 +/- 0.14 microK, which favors large values of Omega_Lambda \simeq 0.8 for flat FRW models. On smaller scales, theta < 1deg, the correlations disappear. This is contrary to what would be expected from the ISW effect, but the absence of correlations may be simply explained if the ISW signal was being cancelled by anti-correlations arising from the thermal Sunyaev-Zeldovich (SZ) effect.

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