Cross-correlating the Microwave Sky with Galaxy Surveys
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We present results for the cross-correlation between the WMAP 1st-year cosmic microwave background (CMB) anisotropy data and optical galaxy surveys: the APM and SDSS DR1 catalogs. Our measurement of a positive CMB-galaxy correlation on large angles (θ> 4 deg) yields significant detections of the Integrated Sachs-Wolfe (ISW) effect and provides a new estimate of dark-energy in the universe, Ω_Λ=0.69-0.86 (2 σrange). In addition, the correlated signal on small angles (θ<1 deg) reveals the imprint left by hot intra-cluster gas in the CMB photons: the thermal Sunyaev-Zeldovich (SZ) effect
7 pages. Invited talk at XVth Rencontres de Blois (France): "Physical Cosmology", June 2003. References added
7 pages. Invited talk at XVth Rencontres de Blois (France): "Physical Cosmology", June 2003. References added