Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.177...19b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 177, Oct. 1976, p. 19-29. Research supported by Magdalen College and Li
Astronomy and Astrophysics
Astronomy
139
Elliptical Galaxies, Galactic Evolution, Galactic Rotation, Red Shift, Cosmology, Galactic Structure, Mathematical Models, Relaxation (Mechanics), Stellar Motions
Scientific paper
There is as yet no conclusive observational evidence to indicate at what redshift the first massive galaxies formed. If the redshift was less than 10, the formation of galaxies is likely to have involved the formation of pancakes of stars. This paper investigates the possibility that elliptical galaxies formed by the violent relaxation of such sheets of stars. A numerical simulation of the relaxation process indicates that the final equilibrium configuration of stars will be markedly flattened whether or not the pancake of stars possessed rotation. The form of the equilibrium configuration which evolves in this way from a pancake appears to be consistent with a Hubble luminosity profile. The model is also consistent with the only published rotation curve of an elliptical galaxy in that it suggests that rotation may not always be dynamically important for such galaxies.
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