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

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

2008-02-15

arxiv.org/abs/0802.2207v2

Astrophys.Space Sci.324:259-263,2009

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. Review talk given at the meeting on "Young massive star clusters - Initial conditions and environments", E

Scientific paper

10.1007/s10509-009-0116-5

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 per cent 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 that is the critical factor. 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.

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