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We selected a mass-limited sample of 4048 objects from the VIMOS VLT DeepSurvey in the redshift interval 0.5<z<1.3. We used the amplitude of the 4000Balmer break (Dn4000) to separate the galaxy population and the EW[OII]3727line as proxy for the star formation activity. We discuss to what extentstellar mass drives galaxy evolution, showing for the first time the interplaybetween stellar ages and stellar masses over the past 8Gyr. Low-mass galaxieshave small Dn4000 and at increasing stellar mass, the galaxy distribution movesto higher Dn4000 values as observed in the local Universe. As cosmic time goesby, we witness an increasing abundance of massive spectroscopically ET systemsat the expense of the LT systems. This spectral transformation is a processstarted at early epochs and continuing efficiently down to the local Universe.This is confirmed by the evolution of our type-dependent stellar mass function.The underlying stellar ages of LT galaxies apparently do not show evolution,likely as a result of a continuous formation of new stars. All star formationactivity indicators consistently point towards a star formation history peakedin the past for massive galaxies, with little or no residual star formationtaking place in the most recent epochs. The activity and efficiency of formingstars are mechanisms that depend on stellar mass, and the mass assembly becomesprogressively less efficient in massive systems as time elapses. The conceptsof star formation downsizing and mass assembly downsizing describe a singlescenario that has a top-down evolutionary pattern. The role of (dry) mergingevents seems to be only marginal at z<1.3, as our estimated efficiency instellar mass assembly can possibly account for the progressive accumulation ofpassively evolving galaxies.

The VIMOS VLT Deep Survey: Tracing the galaxy stellar mass assembly history over the last 8Gyr