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We present a parameter-less approach to predict the shape of the infrared(IR) luminosity function (LF) at redshifts z < 2. It requires no tuning andrelies on only three observables: (1) the redshift evolution of the stellarmass function for star-forming galaxies, (2) the evolution of the specific starformation rate (sSFR) of main-sequence galaxies, and (3) the double-Gaussiandecomposition of the sSFR-distribution at fixed stellar mass into acontribution (assumed redshift- and mass-invariant) from main-sequence andstarburst activity. This self-consistent and simple framework provides apowerful tool for predicting cosmological observables: observed IR LFs aresuccessfully matched at all z < 2, suggesting a constant or only weaklyredshift-dependent contribution (8-14%) of starbursts to the star formationrate density. We separate the contributions of main-sequence and starburstactivity to the global IR LF at all redshifts. The luminosity threshold abovewhich the starburst component dominates the IR LF rises from log(LIR/Lsun) =11.4 to 12.8 over 0 < z < 2, reflecting our assumed (1+z)^2.8-evolution of sSFRin main-sequence galaxies.

The contribution of starbursts and normal galaxies to infrared luminosity functions at z < 2