Equilibria and evolutions of magnetized, rotating, isothermal clouds. II - The extreme case: Nonrotating clouds

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Abstract

Structures of nonrotating magnetized clouds are investigated from a standpoint of the equilibrium solution of the cloud confined by an external pressure which is threaded by uniform magnetic field at infinity. Equilibria for wide ranges of parameters are studied: the ratio of the external thermal pressure to the magnetic pressure ranges from 10-2 to 5 and the center-to-surface density ratio ranges from 2 to 104. The authors obtain two different equilibrium states with the same mass but with different central density. It is shown from the mass - central density relation that the solution with lower central density is stable and that with higher central density is unstable.

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