Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.280.1101p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 280, Issue 4, pp. 1101-1109.
Astronomy and Astrophysics
Astronomy
4
Stars: Formation, Galaxies: Abundances, Galaxies: Evolution, Galaxies: Formation
Scientific paper
If a galactic disc is formed by infall of matter which possesses inappropriate specific angular momentum for circular orbit at its initial radial position, the matter will move radially to achieve centrifugal equilibrium. We solve the equations leading to such equilibrium in the inner regions of the disc. We find that the approach is rapid, and that few stars form on significantly non-circular orbits. The outer region of the disc, where departures from centrifugal equilibrium remain significant, contains little mass in the form of either gas or stars. With a star formation rate proportional to the square of the gas surface density, radial abundance gradients are produced which are somewhat lower than those typically observed for HII regions in spiral galaxies. The gradients are, however, significantly greater than those obtained when radial flows are absent.
Pitts E.
Tayler Roger John
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