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By combining the 0.12 square degree F814W Hubble Space Telescope (HST) andSpitzer MIPS 24 micron imaging in the First Look Survey (FLS), we investigatethe properties of interacting and merging Mid-Infrared bright and faint sourcesat 0.2< z <1.3. We find a marginally significant increase in the pair fractionfor MIPS 24 micron detected, optically selected close pairs, pairfraction=0.25+/-0.10 at z~1, in contrast to 0.11+/-0.08 at z~0.4, whilegalaxies below our 24 micron MIPS detection limit show a pair fractionconsistent with zero at all redshifts. Additionally, 24 micron detectedgalaxies with fluxes >0.1mJy are on average five times more likely to be in aclose galaxy pair between 0.2< z <1.3 than galaxies below this flux limit.Using the 24 micron flux to derive the total Far-IR luminosity we find thatpaired galaxies (early stage mergers) are responsible for 27% +/-9% of the IRluminosity density resulting from star formation at z~1 while morphologicallyclassified (late stage) mergers make up 34%+/-11%. This implies that 61%+/-14%of the infrared luminosity density and in turn ~40% of the star formation ratedensity at z~1 can be attributed to galaxies at some stage of a major merger orinteraction. We argue that, close pairs/mergers in a LIRG/ULIRG phase becomeincreasingly important contributers to the IR luminosity and star formationrate density of the Universe at z>0.7.Comment: accepted for publication in ApJ, 10 page

The Role of Galaxy Interactions and Mergers in Star Formation atz ≤ 1.3: Mid‐Infrared Properties in theSpitzerFirst Look Survey