Physics
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215..483b&link_type=abstract
Astrophysical Journal, Part 1, vol. 215, July 15, 1977, p. 483-491. Research supported by Magdalen College and Lindemann Trust.
Physics
154
Astronomical Models, Energy Dissipation, Galactic Evolution, Gravitational Collapse, Hydrodynamics, Elliptical Galaxies, Galactic Structure, Gas Mixtures, Helium, Hydrogen Clouds, Shock Fronts
Scientific paper
The literature on nonlinear stages of galaxy formation is briefly reviewed along with arguments that lead to the consideration of a dissipative formation process. Hydrodynamic calculations are presented for the collapse of protogalactic gas clouds at redshifts less than 10; it is assumed that the clouds do not fragment during their first infall, so that the collapse is halted by shock-front formation about a caustic surface. The cooling, later fragmentation, evaporation, and binding-energy loss of such clouds are investigated, and ways in which these processes may have influenced the formation of elliptical and disk galaxies are discussed. A simple model for the formation of the Hubble sequence is outlined in which mass and perturbation morphology, together with the physics governing the cooling of a hydrogen-helium mixture, determine the type of galaxy that is formed from a whole range of protogalactic clouds.
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