Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..251f&link_type=abstract
Astronomy and Astrophysics, vol. 60, no. 2, Sept. 1977, p. 251-257.
Astronomy and Astrophysics
Astrophysics
10
Fission, Galactic Evolution, Gas Dynamics, Rotating Matter, Angular Velocity, Density Distribution, Gas Density, Gas Temperature, Rotating Disks, Shock Waves, Velocity Distribution
Scientific paper
The nonlinear motions of a self-gravitating gaseous disk are followed numerically by the fluid-in-cell method. For an elongated rotating disk a shock wave occurs along the major axis when the circulating gases cross the equipotential surface of the disk. The resultant nonaxisymmetric condensation leads to the growth of a 'pear-shaped' deformation which divides into two independent objects. The fission occurs before an axial ratio corresponding to one of the Riemann or Jacobi ellipsoids (which are unstable against third-order deformations) is reached. For highly elongated disks and at large gas densities, multiple fragmentation takes place. A short-lived ringlike condensation is sometimes observed.
Fujimoto Minoru
Sorensen Anders Sondberg
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