Centrally condensed turbulent clouds; Massive star formation or fragmentation?

CL Dobbs, Ian Alexander Bonnell, PC Clark

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

We present numerical investigations into the formation of massive stars from turbulent cores of density structure rho infinity r(-1.5). The results of five hydrodynamical simulations are described, following the collapse of the core, fragmentation and the formation of small clusters of protostars. We generate two different initial turbulent velocity fields corresponding to power-law spectra P proportional to k(-4) and P proportional to k(-3.5), and we apply two different initial core radii. Calculations are included for both completely isothermal collapse, and a non-isothermal equation of state above a critical density (10(-14) g cm(-3)). Our calculations reveal the preference of fragmentation over monolithic star formation in turbulent cores. Fragmentation was prevalent in all the isothermal cases. Although disc fragmentation was largely suppressed in the non-isothermal runs due to the small dynamic range between the initial density and the critical density, our results show that some fragmentation still persisted. This is inconsistent with previous suggestions that turbulent cores result in the formation of a single massive star. We conclude that turbulence cannot be measured as an isotropic pressure term.

Original languageEnglish
Pages (from-to)2
Number of pages2
JournalMonthly Notices of the Royal Astronomical Society
Volume360
DOIs
Publication statusPublished - 11 Jun 2005

Keywords

  • hydrodynamics
  • turbulence
  • stars : formation
  • MOLECULAR CLOUDS
  • STELLAR CLUSTERS
  • DENSE CORES
  • ACCRETION

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