Improving star cluster survival with centrally peaked star-formation efficiency profile

Bekdaulet Shukirgaliyev , ARI
We study the formation of the bound clusters after instantaneous gas expulsion, when the cluster forms with centrally peaked star-formation efficiency (SFE) profile. That means our embedded cluster has steeper density profile than that of initial and residual star forming gas at the time of gas expulsion. This is the consequence of star-formation proceeding with a constant SFE per free-fall time in centrally-concentrated spherically-symmetric molecular gas clump according to the local-density-driven cluster formation model by Parmentier and Pfalzner (2013). We assume our embedded cluster in virial equilibrium with the gravitational potential of whole clump (star+gas) at the time of gas expulsion. We perform a grid of direct N-body simulations, starting from instantaneous gas expulsion time with different global SFEs and cluster initial stellar masses. We found that the minimum global SFE needed to survive instantaneous gas expulsion is 13 percent for the isolated cluster and 15 percent for the cluster in the Solar Neighbourhood.
ITA "blackboard" Colloquium
12 Feb 2018, 11:15
Philosophenweg, 12, 106

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