Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..155e&link_type=abstract
In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J
Astronomy and Astrophysics
Astronomy
Globular Clusters, Star Formation
Scientific paper
Formation mechanisms for star clusters are reviewed. These include the possibility of steady and isolated gravitational contraction inside a molecular cloud compression by internal or external turbulence and compression by nearby HII regions stellar winds and supernovae. In all cases the cluster mass function comes from the cloud mass function but the cluster function is slightly steeper -- perhaps as a result of shorter formation times for smaller clusters. Because clouds extend to much larger masses than clusters and clusters can form in a cloud of any mass there arises a size-of-sample effect in which more active regions form more massive clusters by common mechanisms. The distinction between dense clusters and loose associations with the same mass is the result of environmental pressure with dense clusters requiring higher pressures. The average interstellar pressure depends on the gas surface density which also determines the areal star formation rate so regions with high star formation rates tend to form extremely massive and dense clusters such as young globulars.
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