Starburst in the Intragroup Medium of Stephan's Quintet | Zendy

C. K. Xu | Zendy; J. W. Sulentic | Zendy; Richard J. Tuffs | Zendy

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Starburst in the Intragroup Medium of Stephan's Quintet

Author(s) -

C. K. Xu,

J. W. Sulentic,

Richard J. Tuffs

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/306771

Subject(s) - galaxy , physics , astrophysics , star formation , infrared , intergalactic medium , galaxy group , intergalactic travel , astronomy , galaxy formation and evolution , redshift

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

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