Fragmentation and Evolution of Molecular Clouds. I: Algorithm and First Results

Details Fragmentation and Evolution of Molecular Clouds. I: Algorithm and First Results Fragmentation and Evolution of Molecular Clouds. I: Algorithm and First Results

2005-04-30

arxiv.org/abs/astro-ph/0505008v2

Astronomy and Astrophysics

Astrophysics

47 pages, 15 figures (2 grayscale, one color), ApJ Suppl, in press

Scientific paper

10.1086/500090

We present a series of simulations of the fragmentation of a molecular cloud, leading to the formation of a cluster of protostellar cores. The purpose of these simulations is to address a specific numerical problem called artificial fragmentation, that plagues SPH simulations of cloud fragmentation. We argue that this is a serious problem that needs to be addressed, and that the only reasonable and practical way to address it is to use a relatively new technique called particle splitting. Our largest simulation has an effective resolution of 256^3 particles (much higher than most previous SPH simulations of cloud fragmentation) and results in the formation of a dense cluster containing ~3000 protostellar cores. It is the first simulation of this kind to properly resolve the Jeans mass throughout the entire system, at all times, thus preventing artificial fragmentation.

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