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We present results of our 1.4 GHz image stacking analysis of mass-selectedgalaxies in the COSMOS field. From the resulting median radio continuum fluxdensity we have determined the evolution of the average star formation rate(SFR) of galaxies as a function of stellar mass, unbiased from effects of dustbut also source confusion due to the 1.5" angular resolution achieved by theVLA. We find a power-law relation between specific SFR (SSFR) and stellar massfor star forming galaxies out to z=3. While higher mass systems exhibit lowerSSFRs at any epoch, no differential, more rapid evolution of high mass galaxiesis evident at least out to z~1.5 where our conclusions are most robust.Utilizing measured mass functions of star forming systems, the characteristicstellar mass for galaxies contributing most to the comoving SFR density appearsnot to evolve. These findings hence challenge 'downsizing' scenarios in whichstar formation has gradually shifted towards lower mass systems with cosmictime. Our analysis constitutes the to-date best determination of the cosmicstar formation history (CSFH) since z=3 and yields indirect evidence for arapid decline of the global mass density of molecular gas with time.

A constant characteristic mass for star forming galaxies since z~3 revealed by radio emission in the COSMOS field