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We use the full VIPERS redshift survey in combination with SDSS-DR7 toexplore the relationships between star-formation history (using d4000), stellarmass and galaxy structure, and how these relationships have evolved since z~1.We trace the extents and evolutions of both the blue cloud and red sequence, byfitting double Gaussians to the d4000 distribution of galaxies in narrowstellar mass bins, for four redshift intervals over 0<z<1. This revealsdownsizing in star formation, as the high-mass limit of the blue cloud retreatssteadily with time from M*~10^11.2 M_sun at z~0.9 to M*~10^10.7 M_sun by thepresent day. The number density of massive blue-cloud galaxies (M*>10^11 M_sun,d4000<1.55) drops sharply by a factor five between z~0.8 and z~0.5. Thesegalaxies are becoming quiescent at a rate that largely matches the increase inthe numbers of massive passive galaxies seen over this period. We examine thesize-mass relation of blue cloud galaxies, finding that its high-mass boundaryruns along lines of constant M*/r_e or equivalently inferred velocitydispersion. Larger galaxies can continue to form stars to higher stellar massesthan smaller galaxies. As blue cloud galaxies approach this high-mass limit,they start to be quenched, their d4000 values increasing to push them towardsthe green valley. In parallel, their structures change, showing higher Sersicindices and central stellar mass densities. For these galaxies, bulge growth isnecessary for them to reach the high-mass limit of the blue cloud and bequenched by internal mechanisms. The blue cloud galaxies that are beingquenched at z~0.8 lie along the same size-mass relation as present dayquiescent galaxies, and seem the likely progenitors of today's S0s.

astronomy and astrophysics

The VIMOS Public Extragalactic Redshift Survey (VIPERS): Downsizing of  the blue cloud and the influence of galaxy size on mass quenching over the  last eight billion years