Indicators for cluster survivability in a dispersing cloud

Abstract

We use N-body simulations to survey the response of embedded star clusters to the dispersal of their parent molecular cloud. The final stages of the clusters can be divided into three classes: the cluster (i) is destroyed, (ii) has a loose structure, and (iii) has a compact core. We are interested in three of the governing parameters of the parent cloud: (i) the mass, (ii) the size, and (iii) the dispersing rate. It is known that the final stage of the cluster is well correlated with the star formation efficiency (SFE) for systems with the same cluster and cloud profile. We deem that the SFE alone is not enough to address systems with clouds of different sizes. Our result shows that the initial cluster-cloud mass ratio at a certain Lagrangian radius, and the initial kinetic energy are better indicators for the survivability of embedded clusters.

accepted for publication in ApJ

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• The evolution of embedded star clusters
• Is the massive young cluster Westerlund I bound?
• Surviving infant mortality in the hierarchical merging scenario
• The Dynamics, Structure, and Fate of a Young Cluster During Gas Dispersal: Hectoschelle, Chandra, Spitzer, and Gaia Observations of CepOB3b
• Star Cluster Formation from Turbulent Clumps. I. The Fast Formation Limit
• Centrally concentrated star formation in young clusters