Starburst in the Intragroup Medium of Stephan's Quintet

Abstract

Based on new ISO mid-infrared 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 Stephan's Quintet (Source A in Fig.1). We demonstrate that this starburst is caused by a collision 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 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.

arXiv comment17 pages, 2 PS figures. Accepted by ApJ

References in corpus (3)

• Galaxy Harassment and the Evolution of Clusters of Galaxies
• Gasdynamics and Starbursts in Major Mergers
• The dynamical status of Stephan's Quintet

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