A high redshift detection of the integrated Sachs-Wolfe effect

Abstract

We present evidence of a large angle correlation between the cosmic microwave background measured by WMAP and a catalog of photometrically detected quasars from the SDSS. The observed cross correlation is (0.30 +- 0.14) microK at zero lag, with a shape consistent with that expected for correlations arising from the integrated Sachs-Wolfe effect. The photometric redshifts of the quasars are centered at z ~ 1.5, making this the deepest survey in which such a correlation has been observed. Assuming this correlation is due to the ISW effect, this constitutes the earliest evidence yet for dark energy and it can be used to constrain exotic dark energy models.

10 pages, 11 figures. Minor modifications of the original, version accepted by PRD

References in corpus (2)

• Detection of the ISW and SZ effects from the CMB-Galaxy correlation
• Constraining dark energy with cross-correlated CMB and Large Scale Structure data

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