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Galaxies in pairs show enhanced star formation (SF) compared to theircounterparts in isolation, which is often explained by the tidal effect ofneighboring galaxies. Recent observations, however, reported that galaxiespaired with early-type neighbors do not undergo the SF enhancement. Here werevisit the influence of neighbors using a large sample of paired galaxies fromthe Sloan Digital Sky Survey and a carefully constructed control sample ofisolated counterparts. We find that star-forming neighbors enhance SF, and evenmore so for more star-forming (and closer) neighbors, which can be attributedto collisions of interstellar medium (ISM) leading to SF. We further find that,contrary to the anticipated tidal effect, quiescent neighbors quench SF, andeven more so for more quiescent (and closer) neighbors. This seems to be due toremoval of gas reservoirs via ram pressure stripping and gas accretion cutoffby hot gas halos of quiescent neighbors, on top of their paucity of ISM tocollide to form stars. Our findings, especially the intimate connection of SFto the status and strength of neighbors' SF, imply that the hydrodynamicmechanisms, along with the tidal effect, play a crucial role during the earlyphase of galactic interactions.

Living with Neighbors. I. Observational Clues to Hydrodynamic Impact of Neighboring Galaxies on Star Formation