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Bimodal regime in young massive clusters leading to subsequent stellar generations

Published online by Cambridge University Press:  31 March 2017

Richard Wünsch ,
Jan Palouš ,
Guillermo Tenorio-Tagle ,
Casiana Muñoz-Tuñón  and
Soňa Ehlerová
Richard Wünsch
Affiliation:
Astronomical Institute of the Czech Academy of Sciences, v.v.i. Boční II 1401, 141 31 Prague, Czech Republic email: richard@wunsch.cz
Jan Palouš
Affiliation:
Astronomical Institute of the Czech Academy of Sciences, v.v.i. Boční II 1401, 141 31 Prague, Czech Republic email: richard@wunsch.cz
Guillermo Tenorio-Tagle
Affiliation:
Instituto Nacional de Astrofísica Optica y Electrónica AP 51, 72000 Puebla, México
Casiana Muñoz-Tuñón
Affiliation:
Instituto de Astrofísica de Canarias 38200 La Laguna, Tenerife, Spain
Soňa Ehlerová
Affiliation:
Astronomical Institute of the Czech Academy of Sciences, v.v.i. Boční II 1401, 141 31 Prague, Czech Republic email: richard@wunsch.cz
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Abstract

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Massive stars in young massive clusters insert tremendous amounts of mass and energy into their surroundings in the form of stellar winds and supernova ejecta. Mutual shock-shock collisions lead to formation of hot gas, filling the volume of the cluster. The pressure of this gas then drives a powerful cluster wind. However, it has been shown that if the cluster is massive and dense enough, it can evolve in the so–called bimodal regime, in which the hot gas inside the cluster becomes thermally unstable and forms dense clumps which are trapped inside the cluster by its gravity. We will review works on the bimodal regime and discuss the implications for the formation of subsequent stellar generations. The mass accumulates inside the cluster and as soon as a high enough column density is reached, the interior of the clumps becomes self-shielded against the ionising radiation of stars and the clumps collapse and form new stars. The second stellar generation will be enriched by products of stellar evolution from the first generation, and will be concentrated near the cluster center.

Keywords

globular clusters: generalgalaxies: starburstgalaxies: star clusters: generalgalaxies: star formationstars: windsoutflowshydrodynamicsradiative transfer
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 294 - 301
Copyright
Copyright © International Astronomical Union 2017 

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