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It has been argued that the specific star formation rates of star forminggalaxies inferred from observational data decline more rapidly below z = 2 thanis predicted by hierarchical galaxy formation models. We present a detailedanalysis of this problem by comparing predictions from the GALFORMsemi-analytic model with an extensive compilation of data on the average starformation rates of star-forming galaxies. We also use this data to infer theform of the stellar mass assembly histories of star forming galaxies. Ouranalysis reveals that the currently available data favour a scenario where thestellar mass assembly histories of star forming galaxies rise at early timesand then fall towards the present day. In contrast, our model predicts stellarmass assembly histories that are almost flat below z = 2 for star forminggalaxies, such that the predicted star formation rates can be offset withrespect to the observational data by factors of up to 2-3. This disagreementcan be explained by the level of coevolution between stellar and halo massassembly that exists in contemporary galaxy formation models. In turn, thisarises because the standard implementations of star formation and supernovafeedback used in the models result in the efficiencies of these processremaining approximately constant over the lifetime of a given star forminggalaxy. We demonstrate how a modification to the timescale for gas ejected byfeedback to be reincorporated into galaxy haloes can help to reconcile themodel predictions with the data.

The evolution of the star forming sequence in hierarchical galaxy formation models