Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.193..189f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 193, Oct. 1980, p. 189-206. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
661
Disk Galaxies, Galactic Evolution, Galactic Rotation, Galactic Structure, Halos, Angular Momentum, Astronomical Models, Interstellar Gas, Mass Ratios
Scientific paper
The paper discusses disk galaxies formed from collapsing gas in extended haloes of dark material. It was assumed that these systems were produced by hierarchical clustering and have angular moments from tidal torques. Models were developed to determine the structure of the haloes in terms of observable properties of the disks. It was shown that: (1) collapse factors of 10 or more and halo-to-disk mass ratios of 5 or more are necessary to explain the rapid rotation of the disks; (2) the halo rotation curves computed on the basis of detailed conservation of angular momentum in the disks are flat, and (3) most disks are globally unstable to the formation of non-axisymmetric perturbations unless their mass-to-light ratios are much smaller than current estimates.
Efstathiou George
Fall Michael S.
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