The collapse of a rotating non-axisymmetric isothermal cloud

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Abstract
The collapse of an isothermal cloud which, initially, is uniformly rotating and non-axisymmetric, has been followed using the particle method SPH. The initial model is as similar as possible to that evolved by Boss & Bodenheimer using two finite difference codes. The SPH calculations agree qualitatively with the finite difference calculations up to 1.7 initial free-fall times. Beyond 1.7 free-fall times the present calculations diverge from those of Boss & Bodenheimer who found the final state consisted of a binary system. In the present calculation the two condensations eventually coalesce. We attribute a major part of the difference to the fact that the azimuthal resolution in the Boss–Bodenheimer calculations has degraded significantly during the calculation.

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