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We explore the effects of tidal interactions on star formation (SF) byanalysing a sample of CALIFA survey galaxies. The sample consists of tidallyand non-tidally perturbed galaxies, paired at the closest stellar massdensities for the same galaxy type between subsamples. They are then compared,both on the resolved Star Formation Main Sequence (SFMS) plane and in annularproperty profiles. Star-forming regions in tidally perturbed galaxies exhibitflatter SFMS slopes compared to star-forming regions in non-tidally perturbedgalaxies. Despite that the annular profiles show star-forming regions intidally perturbed galaxies as being mostly older, their SF properties are neverreduced against those ones proper of non-tidally perturbed galaxies.Star-forming regions in non-tidally perturbed galaxies are better candidatesfor SF suppression (quenching). The lowered SF with increasing stellar massdensity in tidally perturbed galaxies may suggest a lower dependence of SF onstellar mass. Though the SFMS slopes, either flatter or steeper, are foundindependent of stellar mass density, the effect of global stellar mass can notbe ignored when distinguishing among galaxy types. Since a phenomenon orproperty other than local/global stellar mass may be taking part in themodulation of SF, the integrated SF properties are related to the tidalperturbation parameter. We find weak, but detectable, positive correlations forperturbed galaxies suggesting that tidal perturbations induced by closecompanions increase the gas accretion rates of these objects.

Star Formation in CALIFA survey perturbed galaxies. I. Effects of Tidal Interactions