The formation of disc galaxies

Details The formation of disc galaxies The formation of disc galaxies

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...120..165j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 120, no. 2, April 1983, p. 165-180.

Astronomy and Astrophysics

Astrophysics

51

Astronomical Models, Cosmology, Disk Galaxies, Galactic Evolution, Compton Effect, Density Distribution, Galactic Bulge, Gravitational Collapse, Stellar Evolution

Scientific paper

In the present disk galaxy formation model, the thick disk component and central bulge are the first systems to form in a nonspherical and massive dark halo, and the disk is not in centrifugal equilibrium except in the central parts. Subsequent dynamical processes give the disk the presently observed exponential density distribution. By forming the thin disk from the gas lost by thick disk stellar evolution and primordial gas accretion, the model explains both the thinness of this component and the apparent universality of its exponential-type profile. Attention is given to the collapse and fragmentation of gas in nonspherical halo potentials, showing the great likelihood of the formation of a hot gaseous disk, which will cool and form stars on a time scale which is shorter than the halo radial dynamical time. A more centrally condensed subsystem leads to the formation of the bulge.

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