SIMBAD references

2006MNRAS.369L...9B - Mon. Not. R. Astron. Soc., 369, L9-L13 (2006/June-2)

Evidence for the strong effect of gas removal on the internal dynamics of young stellar clusters.

BASTIAN N. and GOODWIN S.P.

Abstract (from CDS):

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').


Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): stellar dynamics - methods: {em N}-body simulations - galaxies: star clusters

CDS comments: Clusters: M82-F =[OM78] F, NGC 1569-A = [BDS2000] C4.

Simbad objects: 11

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