Angular momentum distributions and energies of rotating selfgravitating discs

Details Angular momentum distributions and energies of rotating selfgravitating discs Angular momentum distributions and energies of rotating selfgravitating discs

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...157..365s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 157, no. 2, March 1986, p. 365-371.

Astronomy and Astrophysics

Astrophysics

Angular Momentum, Cosmology, Galactic Evolution, Interstellar Gas, Rotating Disks, Stellar Evolution, Angular Velocity, Cartesian Coordinates, Disk Galaxies, Rotating Cylinders

Scientific paper

Angular momentum distributions and energies for a variety of rotating infinitely thin discs are calculated. The infinitely thin discs are mainly considered to be zero order approximations of flat disk-like selfgravitating gases with differential rotation. The angular momentum distributions and the energies of different discs are compared under the assumption of the same total mass and total angular momentum. Discs with various rotation laws show nearly identical angular momentum distributions. The total energies of these discs are also nearly equal. The influence of a finite disc thickness on the angular momentum distribution is briefly discussed. For comparison, angular momentum distributions of rotating cylinders with an infinite uniform extent in the direction of the rotation axis are calculated using the rotation laws of the discs. The influence of a massive nonrotating sphere surrounding a disc is discussed. In particular an exponential disc embedded in a halo with a density power law, ρ ≡ r-2 is considered. Conclusions are drawn regarding the relevance of angular momentum conservation for the hydrodynamics of gaseous discs.

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