Gravitational contraction of cold interstellar clouds containing a magnetic field

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Gravitational Effects, Interstellar Gas, Interstellar Magnetic Fields, Isothermal Processes, Stellar Evolution, Stellar Models, Angular Velocity, Cosmology, Galactic Evolution

Scientific paper

A simplified picture is considered for the isothermal gravitational contraction of a rotating gas cloud containing a magnetic field. After attaining a state of centrifugal equilibrium, the cloud, while losing angular momentum, slowly contracts to a density where substantial magnetic-field diffusion through the gas begins. Subsequently, the cloud contracts into a disk until condensations of approximately stellar mass appear within it. It is shown that contraction will be completed in less than 10 million years if the initial angular momentum of the cloud is very small or if the medium where the cloud originated has a density of at least 10 to the -20th power g/cu cm. In other cases, tens of millions of years may be required for condensation of the gas into stars due to the low efficiency of magnetic-field deceleration of cloud rotation.

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