Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-29
Phys.Rev.D77:123520,2008
Astronomy and Astrophysics
Astrophysics
24 pages, 15 figures. Version accepted by PRD. Improved quasar data, revised parameter constraints
Scientific paper
10.1103/PhysRevD.77.123520
We present a global measurement of the integrated Sachs-Wolfe (ISW) effect obtained by cross-correlating all relevant large scale galaxy data sets with the cosmic microwave background radiation map provided by the Wilkinson Microwave Anisotropy Probe. With these measurements, the overall ISW signal is detected at the ~ 4.5 sigma level. We also examine the cosmological implications of these measurements, particularly the dark energy equation of state w, its sound speed, and the overall curvature of the Universe. The flat LCDM model is a good fit to the data and, assuming this model, we find that the ISW data constrain Omega_m = 0.20 +0.19 -0.11 at the 95% confidence level. When we combine our ISW results with the latest baryon oscillation and supernovae measurements, we find that the result is still consistent with a flat LCDM model with w = -1 out to redshifts z > 1.
Boughn Stephen P.
Crittenden Robert G.
Giannantonio Tommaso
Myers Adam D.
Nichol Robert C.
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