Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988azh....65..771b&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 65, July-Aug. 1988, p. 771-777. In Russian.
Astronomy and Astrophysics
Astronomy
3
Galactic Clusters, Gas Dynamics, Gas-Gas Interactions, Supersonic Speed, Angular Momentum, Astronomical Models, Galactic Mass, Gravitational Effects
Scientific paper
The nonlinear gas-dynamical process of noncentral supersonic collision of large gaseous masses moving under their own gravity within a protogroup or a protocluster is studied. A two-dimensional numerical model is used, in which each mass is nonrotating and in hydrodynamical equilibrium before the collision. The collision leads to the formation of the system of standard hydrodynamical discontinuities in the area of contact, and to heating and radiative cooling of the gas behind the shock front. As a result, a condensation containing up to 80 percent of the material forms. In the inner layers, the rest of the material does not undergo direct contact collision and leaves the condensation as 'fly-away jets.' The condensation, which evolves into a state of quasiequilibrium, rotates significantly. Its spin angular momentum is gained from the orbital momentum of the masses before the collisions. Under certain conditions, the spin momentum is of about the same order of magnitude as the rotational momentum of the most widespread spiral galaxies.
Barausov D. I.
Chernin Arthur D.
Ushakov A. Y.
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