S316p.19 — Initial dynamical evolution of star clusters with tidal field

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Aug 10th at 6:00 PM until 7:30 PM

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Author(s): Somyoung Park1, Simon Goodwin2, Sungsoo S. Kim1

Institution(s): 1. Kyung Hee University, 2. University of Sheffield

Many young stars are found in bound, gas-free spherical star clusters which are often mass segregated. Gas, on the other hand, is found to be clumpy, filamentary and substructured, and it has been suggested that possibly star clusters form from the rapid collapse and violent relaxation of substructured distributions. We investigate the collapse of fractal stellar distributions with no, weak, and very strong tidal fields. We find that the rapid collapse of fractals into spherical clusters happens quickly with no or a weak tidal field, but very strong tidal fields can significantly disrupt initially substructured distributions before they collapse. This provides constraints on the formation of clusters close to supermassive black holes such as the Arches in our Galaxy.