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Formation of young massive clusters from turbulent molecular clouds

Published online by Cambridge University Press:  31 March 2017

Michiko S. Fujii  and
Simon Portegies Zwart
Michiko S. Fujii
Affiliation:
Division of Theoretical Astronomy, National Astronomical Observatory of Japan 2-21-1 Osawa, Mitaka, Tokyo, Japan email: [email protected]
Simon Portegies Zwart
Affiliation:
Leiden Observatory, Leiden University, Leiden 2300 RA, The Netherlands email: [email protected]
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Abstract

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We simulate the formation and evolution of young star clusters from turbulent molecular clouds using smoothed-particle hydrodynamics and direct N-body methods. We find that the shape of the cluster mass function that originates from an individual molecular cloud is consistent with a Schechter function with power-law slopes of β = −1.73. The superposition of mass functions turn out to have a power-law slope of < −2. The mass of the most massive cluster formed from a single molecular cloud with mass Mg scales with 6.1 M0.51g. The molecular clouds that tend to form massive clusters are much denser than those typical found in the Milky Way. The velocity dispersion of such molecular clouds reaches 20km s−1 and it is consistent with the relative velocity of the molecular clouds observed near NGC 3603 and Westerlund 2, for which a triggered star formation by cloud-cloud collisions is suggested.

Keywords

star clustersyoung massive clustersopen clustersnumerical simulation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 25 - 30
Copyright
Copyright © International Astronomical Union 2017 

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