The shape of the initial cluster mass function: What it tells us about the local star formation efficiency

Parmentier, G., Goodwin, S. P., Kroupa, P. and Baumgardt, H. (2008) The shape of the initial cluster mass function: What it tells us about the local star formation efficiency. Astrophysical Journal, 678 1: 347-352. doi:10.1086/587137

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Author Parmentier, G.
Goodwin, S. P.
Kroupa, P.
Baumgardt, H.
Title The shape of the initial cluster mass function: What it tells us about the local star formation efficiency
Journal name Astrophysical Journal   Check publisher's open access policy
ISSN 0004-637X
1538-4357
Publication date 2008-05-01
Sub-type Article (original research)
DOI 10.1086/587137
Open Access Status File (Publisher version)
Volume 678
Issue 1
Start page 347
End page 352
Total pages 6
Place of publication Philadelphia, PA, United States
Publisher Institute of Physics Publishing
Language eng
Formatted abstract
We explore how the expulsion of gas from star cluster forming cloud cores due to supernova explosions affects the shape of the initial cluster mass function, that is, themass function of star clusterswhen effects of gas expulsion are over.
We demonstrate that if the radii of cluster-forming gas cores are roughly constant over the coremass range, as supported by observations, then more massive cores undergo slower gas expulsion. Therefore, for a given star formation efficiency,
moremassive cores retain a larger fraction of stars after gas expulsion. The initial cluster mass function may thus differ from the coremass function substantially, with the final shape depending on the star formation efficiency. Amassindependent
star formation efficiency of  ~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
Stars : formation
Stellar dynamics
Young globular clusters
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
ERA 2012 Admin Only
 
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