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2007MNRAS.380.1589B - Mon. Not. R. Astron. Soc., 380, 1589-1598 (2007/October-1)
A comprehensive set of simulations studying the influence of gas expulsion on star cluster evolution.
BAUMGARDT H. and KROUPA P.
Abstract (from CDS):
Our simulations show that cluster sizes, bound mass fraction and velocity profile are strongly influenced by the details of the gas expulsion. Although star clusters can survive SFEs as low as 10 per cent if the tidal field is weak and the gas is removed only slowly, our simulations indicate that most star clusters are destroyed or suffer dramatic loss of stars during the gas removal phase. Surviving clusters have typically expanded by a factor of 3 or 4 due to gas removal, implying that star clusters formed more concentrated than as we see them today. Maximum expansion factors seen in our runs are around 10. If gas is removed on time-scales smaller than the initial crossing time, star clusters acquire strongly radially anisotropic velocity dispersions outside their half-mass radii. Observed velocity profiles of star clusters can therefore be used as a constraint on the physics of cluster formation.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): stellar dynamics - methods: {em N}-body simulations - stars: formation - open clusters and associations: general - galaxies: star clusters
Simbad objects: 2
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