Dark halos formed via dissipationless collapse. I - Shapes and alignment of angular momentum

Details Dark halos formed via dissipationless collapse. I - Shapes and alignment of angular momentum Dark halos formed via dissipationless collapse. I - Shapes and alignment of angular momentum

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..405w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 2, p. 405-425.

Statistics

Computation

419

Angular Momentum, Dark Matter, Gravitational Collapse, Many Body Problem, Computational Astrophysics, Halos

Scientific paper

We use N-body simulations on highly parallel supercomputers to study the structure of Galactic dark matter halos. The systems form by gravitational collapse from scale-free and more general Gaussian initial density perturbations in an expanding 400 Mpc-cubed spherical slice of an Einstein-deSitter universe. We analyze the structure and kinematics of about 100 of the largest relaxed halos in each of 10 separate simulations. A typical halo is a triaxial spheroid which tends to be more often prolate than oblate. These shapes are maintained by anisotropic velocity dispersion rather than by angular momentum. Nevertheless, there is a significant tendency for the total angular momentum vector to be aligned with the minor axis of the density distribution.

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