On the limiting ellipticity of galaxies formed by dissipationless collapse

Details On the limiting ellipticity of galaxies formed by dissipationless collapse On the limiting ellipticity of galaxies formed by dissipationless collapse

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....79...35o&link_type=abstract

Astronomy and Astrophysics, vol. 79, no. 1-2, Oct. 1979, p. 35-39.

Astronomy and Astrophysics

Astrophysics

Elliptical Galaxies, Galactic Evolution, Galactic Structure, Gravitational Collapse, Oblate Spheroids, Anisotropic Media, Astronomical Models, Ellipticity, Galactic Rotation

Scientific paper

The model of a homogeneous oblate spheroid that has a global anisotropy of velocity dispersion is used to show that the limiting ellipticity of a galaxy formed by dissipationless collapse is equal to 0.8321. This is considerably greater than the analogous maximum ellipticity value of 0.7091 obtained by Thuan and Gott (1975), who used the model of a homogeneous spheroid with isotropic 'pressure'. However, neither of these models proves that real galaxies were formed during dissipationless collapse, due to the fact that both models are inadequate for explaining the small rotation of elliptical galaxies.

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