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Title:
Evidence for the strong effect of gas removal on the internal dynamics of young stellar clusters
Authors:
Bastian, N.; Goodwin, S. P.
Affiliation:
AA(Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT), AB(Department of Physics and Astronomy, The University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 369, Issue 1, pp. L9-L13. (MNRAS Homepage)
Publication Date:
06/2006
Origin:
MNRAS
Astronomy Keywords:
stellar dynamics: methods: N-body simulations: galaxies: star clusters, stellar dynamics, methods: N-body simulations, galaxies: star clusters
DOI:
10.1111/j.1745-3933.2006.00162.x
Bibliographic Code:
2006MNRAS.369L...9B

Abstract

We present detailed luminosity profiles of the young massive clusters M82-F, NGC 1569-A and NGC 1705-1 which show significant departures from equilibrium (King and Elson, Fall & Freeman) profiles. We compare these profiles with those from N-body simulations of clusters that have undergone the rapid removal of a significant fraction of their mass as a result of gas expulsion. We show that the observations and simulations agree very well with each other, suggesting that these young clusters are undergoing violent relaxation and are also losing a significant fraction of their stellar mass.

That these clusters are not in equilibrium can explain the discrepant mass-to-light ratios observed in many young clusters with respect to simple stellar population models without resorting to non-standard initial stellar mass functions as claimed for M82-F and NGC 1705-1. We also discuss the effect of rapid gas removal on the complete disruption of a large fraction of young massive clusters (`infant mortality'). Finally, we note that even bound clusters may lose >50 per cent of their initial stellar mass as a result of rapid gas loss (`infant weight-loss').

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