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VV 655, a dwarf irregular galaxy with HI tidal debris, is a companion to thelenticular luminous infrared galaxy (LIRG) NGC 4418. NGC 4418 stands out amongnearby LIRGs due to its dense central concentration of molecular gas and thedusty, bi-polar structures along its minor axis suggestive of a wind driven bya central starburst and possible nuclear activity. We seek to understand theconsequences of the ongoing minor interaction between VV 655 and NGC 4418 forthe evolution of the LIRG, including the origin of the gas supply responsiblefor its unusual nuclear properties. We investigate the structural, kinematic,and chemical properties of VV 655 and NGC 4418 by analyzing archival imagingdata and optical spectroscopic observations from the SDSS-III and new spectrafrom SALT-RSS. We characterize their gas-phase metal abundances and spatiallyresolved, ionized gas kinematics, and demonstrate that the gas-phasemetallicity in NGC 4418 significantly exceeds that in VV 655. No kinematicdisturbances in the ionized gas are observed along the minor axis of NGC 4418,but we see evidence for ionized gas outflows from VV 655 that may increase thecross-section for gas stripping in grazing collisions. A faint, asymmetricouter arm is detected in NGC 4418 of the type normally associated withgalaxy-galaxy interactions. The simplest model suggests that the minorinteraction between VV 655 and NGC 4418 produced the unusual nuclear propertiesof the LIRG via tidal torquing of the interstellar medium of NGC 4418 ratherthan through a significant gas transfer event. In addition to inducing acentral concentration of gas in NGC 4418, this interaction also produced anenhanced star formation rate and an outer tidal arm in the LIRG. The VV 655-NGC4418 system offers an example of the potential for minor collisions to alterthe evolutionary pathways of giant galaxies.

VV 655 and NGC 4418: Implications of an interaction for the evolution of a LIRG