The effect of the dynamical state of clusters on gas expulsion and infant mortality

Abstract

The star-formation efficiency (SFE) of a star cluster is thought to be the critical factor in determining if the cluster can survive for a significant (>50 Myr) time. There is an often quoted critical SFE of ∼30% for a cluster to survive gas expulsion. I reiterate that the SFE is not the critical factor; rather, it is the dynamical state of the stars (as measured by their virial ratio) immediately before gas expulsion. If the stars in a star cluster are born in an (even slightly) cold dynamical state, then the survivability of a cluster can be greatly increased.

Metadata

Item Type:	Article
Authors/Creators:	Goodwin, S.P.
Copyright, Publisher and Additional Information:	© Springer Science+Business Media B.V. 2009. This is an author produced version of a paper subsequently published in Astrophysics and Space Science. Uploaded in accordance with the publisher's self-archiving policy. The final publication is available at Springer via http://dx.doi.org/10.1007/s10509-009-0116-5.
Keywords:	Open clusters and associations: general; Galaxies: star clusters
Dates:	Published: December 2009
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	16 Feb 2018 15:21
Last Modified:	17 Feb 2018 08:16
Published Version:	https://doi.org/10.1007/s10509-009-0116-5
Status:	Published
Publisher:	Springer Verlag
Refereed:	Yes
Identification Number:	10.1007/s10509-009-0116-5
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:127511

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The effect of the dynamical state of clusters on gas expulsion and infant mortality

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