Combined analysis of the integrated Sachs-Wolfe effect and cosmological implications

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 similar to 4.5 sigma level. We also examine the cosmological implications of these measurements, particularly the dark energy equation of state w, its sound speed c(s), and the overall curvature of the Universe. The flat Lambda CDM model is a good fit to the data and, assuming this model, we find that the ISW data constrain Omega(m)=0.20(-0.11)(+0.19) 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 Lambda CDM model with w=-1 out to redshifts z > 1.