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Both observations and simulations show that major tidal interactions ormergers between gas-rich galaxies can lead to intense bursts of starformation.Yet, the average enhancement in star formation rate (SFR) in major mergers andthe contribution of such events to the cosmic SFR are not well estimated. Herewe use photometric redshifts, stellar masses and UV SFRs from COMBO-17, 24micron SFRs from Spitzer and morphologies from two deep HST cosmological surveyfields (ECDFS/GEMS and A901/STAGES) to study the enhancement in SFR as afunction of projected galaxy separation. We apply two-point projectedcorrelation function techniques, which we augment with morphologically-selectedvery close pairs (separation <2 arcsec) and merger remnants from the HSTimaging. Our analysis confirms that the most intensely star-forming systems areindeed interacting or merging. Yet, for massive (M* > 10^10 Msun) star-forminggalaxies at 0.4<z<0.8, we find that the SFRs of galaxies undergoing a majorinteraction (mass ratios <1:4 and separations < 40 kpc) are only 1.80 +/- 0.30times higher than the SFRs of non-interacting galaxies when averaged over allinteractions and all stages of the interaction, in good agreement with otherobservational works.  We demonstrate that these results imply that <10% of star formation at 0.4 <z < 0.8 is triggered directly by major mergers and interactions; these eventsare not important factors in the build-up of stellar mass since z=1.

Less than 10 percent of star formation in z=0.6 massive galaxies is triggered by major interactions