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Based on new ISO mid-infrared observations and ground based $H_\alpha$ andnear-infrared observations, we report the detection of a bright starburst inthe intragroup medium (IGM) of the famous compact group of galaxies Stephan'sQuintet (Source A in Fig.1). We demonstrate that this starburst is caused by acollision between a high velocity ($\delta$V$\sim$ 1000 km/sec) intruder galaxy(NGC7318b) and the IGM of the group. While this is the only starburst knowntoday that is induced by a galaxy/cold-intergalactic-medium collision, itprovides new constraints to the theory for interaction-induced starbursts, andmay hint at a new mechanism for the star formation excess seen in more distantclusters.Comment: 17 pages, 2 PS figures. Accepted by Ap

Starburst in the Intragroup Medium of Stephan's Quintet