Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..315c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 2, p. 315-336.
Astronomy and Astrophysics
Astrophysics
24
Cosmology, Galactic Evolution, Galactic Mass, Galactic Rotation, Hydrodynamic Equations, Astronomical Models, Dark Matter, Perturbation, Shock Wave Propagation
Scientific paper
Four basic physical mechanisms of the generation of rotation of protogalaxies are analyzed. These are: (1) scattering of weak irrotational hydrodynamical perturbations of the galactic mass scale on a strong shock front of the cluster scale; (2) breakdown of barotropy in the galactic scale motions which develop within a layer or shell of gas compressed by the larger scale shocks shocks; (3) strong shock-shock collisions on the cluster scale leading to the formation of tangential discontinuity and its subsequent decay into eddies of the galactic scale; and (4) noncentral inelastic supersonic collision of protogalactic gas clouds with coalescence of the clouds and conversion of their initial angular momenta into the spin momentum of the merger clump. It is shown that, under certain appropriate physical conditions, each of these mechanisms can be effective enough to produce correct amount of angular momentum for rapidly rotating spiral galaxies.
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