Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..96..217c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 96, no. 1, Oct. 1983, p. 217-221.
Astronomy and Astrophysics
Astrophysics
4
Angular Momentum, Galactic Evolution, Galactic Rotation, Spiral Galaxies, Vorticity, Galactic Clusters, Galactic Structure, Hydrodynamics
Scientific paper
The general features of a numerical model of galactic-rotation onset based on hydrodynamic rather than gravitational effects are presented. At the epoch of redshift, gravitational instability or supermassive-star explosions produce both large-scale supersonic shock waves (which in turn lead to the formation of groups and clusters of galaxies as gaseous pancakes) and smaller-scale weak irrotational hydrodynamic perturbations which interact with the shocks to generate vorticity behind the shock fronts. Galaxies and pairs of galaxies forming from the shocked gas gain angular momentum from these eddies in the protogalactic material. The quantitative evaluation of the model is discussed, and the results of a 2D calculation (using 128 x 128 points) of the dynamic structure of the postshock flow are illustrated graphically. The 3D representation (based on axisymmetry) shows a system of tori formed by the vortex stream lines and concentric around a circle where the vortex velocity is zero.
Chernin Arthur D.
Ushakov Iu. A.
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