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Ultraluminous and luminous infrared galaxies (ULIRGs and LIRGs) are the mostextreme star-forming galaxies in the universe, and dominate the total starformation rate density at z>1. In the local universe (z<0.3), the majority ofULIRGs and a significant portion of LIRGs are triggered by interactions betweengas-rich spiral galaxies, yet it is unclear if this is still the case athigh-z. To investigate the relative importance of galaxy interactions ininfrared luminous galaxies, we carry out a comparison of optical morphologicalproperties between local (U)LIRGs and (U)LIRGs at z=0.5-1.5 based on the samesample selection, morphology classification scheme, and optical morphology atsimilar rest-frame wavelengths. In addition, we quantify the systematics incomparing local and high-z datasets by constructing a redshifted dataset fromlocal (U)LIRGs, in which its data quality mimics the high-z dataset. Based onthe Gini-M20 classification scheme, we find that the fraction of interactingsystems decreases by ~8% from local to z<~1, and it is consistent with thereduction between local and redshifted datasets (6(+14-6)%). Based on visualclassifications, the merger fraction of local ULIRGs is found to be ~20% lowercompared to published results, and the reduction due to redshifiting is15(+10-8)%. Consequently, the differences of merger fractions between local andz<~1 (U)LIRGs is only ~17%. These results demonstrate that there is no strongevolution in the fraction of (U)LIRGs classified as mergers at least out toz~1. At z>1, the morphology types of ~30% of (U)LIRGs can not be determined dueto their faintness in the F814W-band, and thus the merger fraction measured atz>1 suffers from large uncertainties.

A comparison of the morphological properties between local and z~1 infrared luminous galaxies. Are local and high-z (U)LIRGs different?