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Abstract: We present preliminary results of an ESO-VLT large programme AMAZE aimed atdetermining the evolution of the mass-metallicity relation at z~3 by means ofdeep near-IR spectroscopy. Gas metallicities and stellar masses are measuredfor an initial sample of nine star forming galaxies at z~3.3. When comparedwith previous surveys, the mass-metallicity relation inferred at z~3.3 shows anevolution significantly stronger than observed at lower redshifts. There arealso some indications that the metallicity evolution of low mass galaxies isstronger relative to high mass systems, an effect which can be considered asthe chemical version of the galaxy downsizing. The mass-metallicity relationobserved at z~3.3 is difficult to reconcile with the predictions of somehierarchical evolutionary models. We shortly discuss the possible implicationsof such discrepancies.

Autor: R. Maiolino, T. Nagao, A. Grazian, F. Cocchia, A. Marconi, F. Mannucci, A. Cimatti, A. Pipino, S. Ballero, A. Fontana, G.L. Grana


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