Dynamical mass segregation on a very short timescale

Details Dynamical mass segregation on a very short timescale Dynamical mass segregation on a very short timescale

2009-06-26

arxiv.org/abs/0906.4806v1

Astrophys.J.700:L99-L103,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

ApJ Letter, accepted

Scientific paper

10.1088/0004-637X/700/2/L99

We discuss the observations and theory of star cluster formation to argue that clusters form dynamically cool (subvirial) and with substructure. We then perform an ensemble of simulations of cool, clumpy (fractal) clusters and show that they often dynamically mass segregate on timescales far shorter than expected from simple models. The mass segregation comes about through the production of a short-lived, but very dense core. This shows that in clusters like the Orion Nebula Cluster the stars >4 Msun can dynamically mass segregate within the current age of the cluster. Therefore, the observed mass segregation in apparently dynamically young clusters need not be primordial, but could be the result of rapid and violent early dynamical evolution.

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