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We present precise Sunyaev-Zeldovich (SZ) effect measurements in thedirection of 62 nearby galaxy clusters (z <0.5) detected at highsignal-to-noise in the first Planck all-sky dataset. The sample spansapproximately a decade in total mass, 10^14 < M_500 < 10^15, where M_500 is themass corresponding to a total density contrast of 500. Combining these highquality Planck measurements with deep XMM-Newton X-ray data, we investigate therelations between D_A^2 Y_500, the integrated Compton parameter due to the SZeffect, and the X-ray-derived gas mass M_g,500, temperature T_X, luminosityL_X, SZ signal analogue Y_X,500 = M_g,500 * T_X, and total mass M_500. Aftercorrection for the effect of selection bias on the scaling relations, we findresults that are in excellent agreement with both X-ray predictions andrecently-published ground-based data derived from smaller samples. The presentdata yield an exceptionally robust, high-quality local reference, andillustrate Planck's unique capabilities for all-sky statistical studies ofgalaxy clusters.

Planck Early Results XI: Calibration of the local galaxy cluster Sunyaev-Zeldovich scaling relations