Bastian, N.; Goodwin, S.P.; (2006) Evidence for the strong effect of gas removal on the internal dynamics of young stellar clusters. Monthly Notices of the Royal Astronomical Society Letters , 369 (1) L9-L13. 10.1111/j.1745-3933.2006.00162.x.

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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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