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Formation of Young Star Clusters

Published online by Cambridge University Press:  30 March 2016

Bruce Elmegreen
Bruce Elmegreen*
Affiliation:
IBM Research Division, T.J. Watson Research Center, PO Box 218, Yorktown Hts., NY, 10598, USA, [email protected]

Abstract

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Turbulence, self-gravity, and cooling convert most of the interstellar medium into cloudy structures that form stars. Turbulence compresses the gas into clouds directly and it moves pre-existing clouds around passively when there are multiple phases of temperature. Self-gravity also partitions the gas into clouds, forming giant regular complexes in spiral arms and in resonance rings and contributing to the scale-free motions generated by turbulence. Dense clusters form in the most strongly self-gravitating cores of these clouds, often triggered by compression from local stars. Pre-star formation processes inside clusters are not well observed, but the high formation rates and high densities of pre-stellar objects, and their power law mass functions suggest that turbulence, self-gravity, and energy dissipation are involved there too.

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 358 - 362
Copyright
Copyright © Astronomical Society of Pacific 2005

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