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For refcode 1999ApJ...512..178X:
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1999ApJ...512..178X Starburst in the Intragroup Medium of Stephan's Quintet CONG XU Infrared Processing and Analysis Center, Jet Propulsion Laboratory, Caltech 100-22, Pasadena, CA 91125; and Max-Planck-Institut fur Kernphysik, Postfach 103980, D69117 Heidelberg, Germany JACK W. SULENTIC Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35487 AND RICHARD TUFFS Max-Planck-Institut fur Kernphysik, Postfach 103980, D69117 Heidelberg, Germany Received 1998 July 24; accepted 1998 September 12 ABSTRACT Based on new Infrared Space Observatory midinfrared observations and ground-based H{alpha} and near-infrared observations, we report the detection of a bright starburst in the intragroup medium (IGM) of the famous compact group of galaxies known as Stephan's Quintet (source A in Fig. 1). We demonstrate that this starburst is caused by a collision between a high-velocity ({delta}V~1000 km s^-1^) intruder galaxy (NGC 7318b) and the IGM of the group. While this is the only starburst known today that is induced by a galaxy/cold intergalactic medium collision, it provides new constraints to the theory for interaction-induced starbursts and may hint at a new mechanism for the star formation excess seen in more distant clusters. Subject headings: galaxies: active-galaxies: interactions-galaxies: ISM- galaxies: starburst-infrared: galaxies-intergalactic medium
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