Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 407, Issue 2, Pages 1098-1107Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2010.16939.x
Keywords
stars: formation; stars: kinematics and dynamics
Categories
Funding
- STFC
- Netherlands Advanced School in Astrophysics (NOVA)
- LKBF
- Netherlands Organisation for Scientific Research (NWO) [643.200.503, 639.073.803]
- National Science Foundation of China [11043006]
- International Space Science Institute in Bern, Switzerland
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Observations and theory both suggest that star clusters form subvirial (cool) with highly substructured distributions. We perform a large ensemble of N-body simulations of moderate-sized (N = 1000) cool, fractal clusters to investigate their early dynamical evolution. We find that cool, clumpy clusters dynamically mass segregate on a short time-scale, that Trapezium-like massive higher order multiples are commonly formed, and that massive stars are often ejected from clusters with velocities > 10 km s-1 (cf. the average escape velocity of 2.5 km s-1). The properties of clusters also change rapidly on very short time-scales. Young clusters may also undergo core collapse events, in which a dense core containing massive stars is hardened due to energy losses to a halo of lower mass stars. Such events can blow young clusters apart with no need for gas expulsion. The warmer and less substructured a cluster is initially, the less extreme its evolution.
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