Gas removal and the initial mass function of star clusters

Parmentier, Geneviève, Goodwin, Simon P., Kroupa, Pavel and Baumgardt, Holger (2009). Gas removal and the initial mass function of star clusters. In: Enrique Pérez, Richard de Grijs and Rosa M. González Delgado, Young Massive Star Clusters: Refereed Papers. Meeting on Young Massive Star Clusters: Initial Conditions and Environments, Granada, Spain, (327-332). 11-14 September 2007. doi:10.1007/s10509-009-0108-5

Author Parmentier, Geneviève
Goodwin, Simon P.
Kroupa, Pavel
Baumgardt, Holger
Title of paper Gas removal and the initial mass function of star clusters
Conference name Meeting on Young Massive Star Clusters: Initial Conditions and Environments
Conference location Granada, Spain
Conference dates 11-14 September 2007
Convener Instituto de Astrofísica de Andalucía (CSIC)
Proceedings title Young Massive Star Clusters: Refereed Papers   Check publisher's open access policy
Journal name Astrophysics and Space Science   Check publisher's open access policy
Place of Publication Dordrecht, Netherlands
Publisher Springer
Publication Year 2009
Sub-type Article (original research)
DOI 10.1007/s10509-009-0108-5
ISSN 0004-640X
Editor Enrique Pérez
Richard de Grijs
Rosa M. González Delgado
Volume 324
Issue 2
Start page 327
End page 332
Total pages 6
Language eng
Formatted Abstract/Summary
We explore how the expulsion of gas from star-forming cores due to supernova explosions affects the shape of the initial cluster mass function, that is, the mass function of star clusters when cluster infant weight-loss triggered by gas expulsion is over. We demonstrate that if the radii of cluster-forming gas ‘cores’ are roughly constant over the core mass range, as supported by observations, then more massive cores undergo slower gas expulsion. Therefore, for a given star-formation efficiency, more massive cores retain a larger fraction of stars after gas expulsion. The initial cluster mass function may thus substantially differ from the core mass function, with the final shape depending on the star-formation efficiency. A mass-independent star-formation efficiency of about 20% turns a power-law core mass function into a bell-shaped initial cluster mass function, while mass-independent efficiencies of order 40% preserve the shape of the core mass function.
Keyword Galaxies: star clusters
Galaxies: starburst
Stars: formation
Luminosity Function
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Publication date: December 2009.

Document type: Conference Paper
Collections: School of Mathematics and Physics
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