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We have used the GALEX ultraviolet telescope to study stellar populations andstar formation morphology in a well-defined sample of 42 nearbyoptically-selected pre-merger interacting galaxy pairs. Galaxy interactionswere likely far more common in the early Universe than in the present, thus ourstudy provides a nearby well-resolved comparison sample for high redshiftstudies. We have combined the GALEX NUV and FUV images with broadband opticalmaps from the Sloan Digitized Sky Survey to investigate the ages andextinctions of the tidal features and the disks. The distributions of theUV/optical colors of the tidal features and the main disks of the galaxies aresimilar, however, the tidal features are bluer on average in NUV - g whencompared with their own parent disks, thus tails and bridges are often moreprominent relative to the disks in UV images compared to optical maps. Thiseffect is likely due to enhanced star formation in the tidal features comparedto the disks rather than reduced extinction, however, lower metallicities mayalso play a role. We have identified a few new candidate tidal dwarf galaxiesin this sample. Other interesting morphologies such as accretion tails and`beads on a string' are also seen in these images. We also identify a possible`Taffy' galaxy in our sample, which may have been produced by a head-oncollision between two galaxies. In only a few cases are strong tidal featuresseen in HI maps but not in GALEX.

Spirals, Bridges, and Tails: A GALEX UV Atlas of Interacting Galaxies