The role of dissipation in the formation of spiral and elliptical galaxies

Details The role of dissipation in the formation of spiral and elliptical galaxies The role of dissipation in the formation of spiral and elliptical galaxies

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...130..397w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 130, no. 2, Jan. 1984, p. 397-409. Research supported by the Deutsche Forschun

Astronomy and Astrophysics

Astrophysics

2

Collision Parameters, Elliptical Galaxies, Energy Dissipation, Galactic Evolution, Spiral Galaxies, Angular Momentum, Astronomical Models, Clouds, Momentum Transfer, Rates (Per Time), Stellar Evolution, Time Response

Scientific paper

The effect of dissipation through cloud-cloud collisions on the formation of spiral and elliptical galaxies is discussed. After reviewing related galaxy formation models based on systems of interacting gas clouds, it is shown theoretically that collisional dissipation may control both the angular momentum gain and the rate of star formation in a protogalaxy, thus largely determining its dynamical and morphological properties. A similarity model is developed which inversely correlates the initial spin of the protogalaxy with its total mass and rate of star formation, in relation to cloud collision dissipation. The model's calculations are found to agree with recent observational data, but it is recommended that future models incorporate a numerical scheme which accounts for the effects of density gradients and shocks on the dynamical relaxation of protoelliptical galaxies.

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