Physics – Fluid Dynamics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980rspta.296..309t&link_type=abstract
(Royal Society, Discussion on the Origin and Early Evolution of the Galaxies, London, England, Feb. 14, 15, 1979.) Royal Society
Physics
Fluid Dynamics
Fluid Dynamics, Jeans Theory, Nebulae, Protostars, Star Formation, Universe, Astronomical Models, Clouds, Gravitational Collapse, Interstellar Gas
Scientific paper
Three-dimensional fluid dynamic numerical calculations of the gravitational fragmentation of Jeans unstable gas clouds undergoing dynamic collapse are reviewed, and the implications of their results on star formation in the early universe are considered. A numerical program was written to follow the self-gravitating collapse of a rotating, isothermal, initially uniform gas cloud, taking into account the effects of gas pressure gradients, and the susceptibility of the models to fragmentation was determined. Results indicate that a collapsing isothermal gas cloud will only fragment if perturbations in initial cloud structure enclose more than a Jeans mass of matter. These results are interpreted to imply that it is highly unlikely that star formation in the early universe produced a significant number of stars with masses less than 30 solar masses, but rather produced a generation of supermassive stars, the remnants of which make up massive galactic haloes and the component of clusters responsible for their large mass:light ratios.
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