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The modification of star formation (SF) in galaxy interactions is a complexprocess, with SF observed to be both enhanced in major mergers and suppressedin minor pair interactions. Such changes likely to arise on short timescalesand be directly related to the galaxy-galaxy interaction time. Here weinvestigate the link between dynamical phase and direct measures of SF ondifferent timescales for pair galaxies, targeting numerous star-formation rate(SFR) indicators and comparing to pair separation, individual galaxy mass andpair mass ratio. We split our sample into the higher (primary) and lower(secondary) mass galaxies in each pair and find that SF is indeed enhanced inall primary galaxies but suppressed in secondaries of minor mergers. We findthat changes in SF of primaries is consistent in both major and minor mergers,suggesting that SF in the more massive galaxy is agnostic to pair mass ratio.We also find that SF is enhanced/suppressed more strongly for short-timeduration SFR indicators (e.g. H-alpha), highlighting recent changes to SF inthese galaxies, which are likely to be induced by the interaction. We propose ascenario where the lower mass galaxy has its SF suppressed by gas heating orstripping, while the higher mass galaxy has its SF enhanced, potentially bytidal gas turbulence and shocks. This is consistent with the seeminglycontradictory observations for both SF suppression and enhancement in closepairs.

Galaxy And Mass Assembly (GAMA): the effect of close interactions on star formation in galaxies