Physics
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ncimr..19f...1c&link_type=abstract
Riv. Nuovo Cimento, Vol. 19, No. 6, p. 1 - 98
Physics
2
Universe: Hydrodynamics, Galaxy Formation, Protogalactic Matter: Shock Waves
Scientific paper
An overview of the problem of the physical nature of galactic rotation and the major results concerning the hydrodynamical mechanisms of the generation of protogalactic eddies are given. Then five physical mechanisms for the vorticity generation in the protogalactic medium are discussed in detail: scattering of weak irrotational hydrodynamical perturbations at the galactic mass-scale on a shock front at the cluster scale; breakdown of barotropy for the galactic-scale motions developing within a gas layer or shell compressed by a large-scale shock; formation of a tangential discontinuity and its subsequent decay in protogalactic-matter currents; strong collisions of shocks leading to the formation of a turbulent interaction zone; noncentral inelastic supersonic collision of protogalactic gas clouds with their coalescence and transformation of their initial relative orbital momentum into the spin momentum of the merger clump. A scenario for the formation of rotating spiral galaxies is suggested which is based on the concept of protogalactic vorticity and incorporates also astronomical data on huge star/gas complexes in galactic disks. The problem of the rotation of star complexes and giant molecular clouds is studied. Lastly, a hydrodynamical approach to the observed phenomenon of violent star formation is suggested based on the physics of shock-shock collision.
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