We cross-correlate the third-year WMAP data with galaxy samples extracted from the SDSS DR5 ( SDSS5 ) covering 16 % of the sky .
These measurements confirm a positive cross-correlation , which is well fitted by the integrated Sachs-Wolfe ( ISW ) effect for flat LCDM models with a cosmological constant .
The combined analysis of different samples gives \Omega _ { \Lambda } = 0.79 - 0.83 ( 68 % Confidence Level , CL ) and \Omega _ { \Lambda } = 0.75 - 0.85 ( 95 % CL ) .