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The bimodality in galaxy properties has been observed at low and highredshift, with a clear distinction between star-forming galaxies in the bluecloud and passively evolving objects in the red sequence; the absence ofgalaxies with intermediate properties indicates that the quenching of starformation and subsequent transition between populations must happen rapidly. Inthis paper, we present a study of over 100 transiting galaxies in the so-called"green valley" at intermediate redshifts (z ~ 0.8). By using very deepspectroscopy with the DEIMOS instrument at the Keck telescope we are able toinfer the star formation histories of these objects and measure the stellarmass flux density transiting from the blue cloud to the red sequence when theuniverse was half its current age. Our results indicate that the processhappened more rapidly and for more massive galaxies in the past, suggesting atop-down scenario in which the massive end of the red sequence is formingfirst. This represent another aspect of downsizing, with the mass flux densitymoving towards smaller galaxies in recent times.

Quenching star formation at intermediate redshifts: downsizing of the mass flux density in the green valley