Star Cluster Formation in Extreme Starburst Environments

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Pixel-by-pixel analysis of a subset of the Hubble Space Telescope Advanced Camera for Surveys Early Release Observations provides a powerful technique to explore the star and star cluster formation histories of the ""Mice"" and ""Tadpole"" interacting galaxies. In each interacting system we find some 40 bright young star clusters. We estimate that the main events triggering the formation of these clusters occurred some 150-200 Myr ago. We show that star cluster formation is a major mode of star formation in galaxy interactions responsible for more than 35% of the active star formation in encounters. This implies that star cluster formation requires extreme conditions including large-scale gas flows and shocks which are naturally found in interacting galaxies.

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