Isothermal Collapse of Rotating Gas Clouds

概要

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The gravitational axisymmetric collapse of rotating isothermal gas clouds has been studied for a number of models with different initial conditions. We have assumed that initially a cloud has no motion in a meridional plane and has a spherical mass distribution. Then, the initial conditions are specified by the ratios of thermal and rotational energies to gravitational energy and by the distributions of density and angular velocity. Two-dimensional hydrodynamical calculations have been performed by means of Fluid-In-Cell method. Calculations show that, in models with low temperatures, the collapse leads to the formation of a rotating ring in the central region of a cloud, in agreement with the results of Larson and of Black and Bodenheimer. The major radius of the ring is very sensitive to the initial conditions; it decreases with the decrease in rotational energy, with the raise in temperature and with the increase in central condensation of mass. On the other hand, in models with high temperatures a final configuration is found to be a rotating spheroid.
1976-08-25