Star Cluster Formation in Clouds with Externally Driven Turbulence

Jamie D. Smith, James E. Dale, Sarah E. Jaffa, Martin G. H. Krause

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Abstract

Star clusters are known to be formed in turbulent molecular clouds. How turbulence is driven in molecular clouds and what effect this has on star formation is still unclear. We compare a simulation setup with turbulent driving everywhere in a periodic box with a setup where turbulence is only driven around the outside of the box. We analyse the resulting gas distribution, kinematics, and the population of stars that are formed from the cloud. Both setups successfully produce a turbulent velocity field with a power law structure function, the externally driven cloud has a more central, monolithic, clump, while the fully driven cloud has many smaller, more dispersed, clumps. The star formation follows the cloud morphology producing large clusters, with high star forming efficiency in the externally driven simulations and sparse individual star formation with much lower star formation efficiency in the fully driven case. We conclude that the externally driven method, which resembles a Global Hierarchical Collapse (GHC) scenario, produces star clusters that more closely match with observations.
Original languageEnglish
Pages (from-to)4212-4219
JournalMonthly Notices of the Royal Astronomical Society
Volume516
Issue number3
Early online date19 Sept 2022
DOIs
Publication statusPublished - 1 Nov 2022

Keywords

  • astro-ph.GA

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