Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.0407x&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #04.07; Bulletin of the American Astronomical Society, Vol. 30, p.1249
Astronomy and Astrophysics
Astronomy
Scientific paper
The only well established triggering mechanism for starbursts involves low velocity encounters/mergers between galaxies. We report the detection of a bright starburst in the intragroup medium (IGM) of the famous compact group of galaxies ``Stephan's Quintet''. This burst is the product of a collision between a high velocity (delta V ~ 1000 km/sec) intruder galaxy (NGC7318b) and the IGM of the group. We present new ISO mid-infrared (15microns and 11.4microns ) and far-infrared (60microns and 100microns ) observations along with new ground-based H_alpha and (K'-band) images. This is the only known starburst that is induced by a galaxy+cold-IGM collision. It provides new constraints on theories about interaction-induced starbursts and may hint at a new mechanism for the star formation excess seen in more distant clusters.
Sulentic Jack
Tuffs Richard
Xu Cong
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