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Arp 104 is a pair of luminous interacting galaxies consisting of NGC 5216, anelliptical, and NGC 5218, a disturbed disk galaxy and joined by a stellarbridge. We obtained optical imaging to support photometric and color studies ofthe system. NGC 5216 lies on the red sequence, while the unusual distributionof stellar population properties in combination with intense central starformation in a dusty region result in NGC 5218 being a nearby example of anintermediate color (green valley) system. The stellar bridge has remarkablyuniform optical surface brightness, with colors consistent with its starscoming from the outskirts of NGC 5218, but is relatively gas-poor while thenorthern tidal tail is rich in HI. While both galaxies contain shells, theshell structures in NGC 5218 are pronounced, and some appear to be associatedwith counter-rotating gas. This combination of features suggests that Arp 104could be the product of distinct multiple interactions in a small galaxy group,possibly resulting from a hierarchical merging process, and likely leading tothe birth of a relatively massive and isolated early-type galaxy.

Optical Structure and Evolution of the Arp 104 Interacting Galaxy System