Isothermal Collapse of Rotating Gas Clouds

Details Isothermal Collapse of Rotating Gas Clouds Isothermal Collapse of Rotating Gas Clouds

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pthph..56..515n&link_type=abstract

Progress of Theoretical Physics, Vol. 56, No. 2, pp. 515-530

Physics

31

Scientific paper

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.

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