Fragmentation of Molecular Clouds

Details Fragmentation of Molecular Clouds Fragmentation of Molecular Clouds

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99r.140m&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.140

Astronomy and Astrophysics

Astronomy

Scientific paper

We have performed high-resolution SPH simulations of the fragmentation of molecular clouds, leading to the formation of a dense cluster of protostellar cores. Our SPH algorithm uses particle splitting in order to achieve very high resolution and ensure that the Jeans mass is properly resolved throughout the simulations. The collapse of molecular gas and its conversion to protostellar cores follows four distinct phases: Growth, Collapse, Accretion, and N-body. We found that competitive accretion is a local phenomenon, with distict regions inside the cloud having different accretion histories. As a result, the correlation between birth rank and final mass of cores is quite weak. The final mass distribution of the cores is lognormal. The mean value is unrelated to the initial Jeans mass of the cloud, and is entirely determined by the resolution limit of the simulations.

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