Mathematics – Logic
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..441d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 2, p. 441-454.
Mathematics
Logic
56
Cosmology, Dark Matter, Galactic Halos, Shear Flow, Angular Momentum, Kinematics, Many Body Problem
Scientific paper
N-body simulations of the collapse of density peaks in the cold dark matter model are employed to examine the effect of cosmological tidal shear on the structure and kinematics of dark halos. The shapes of the density peaks are compared to the shapes of dark halos in order to investigate the origin of the triaxial nature of dark halos. The kinematics are studied on the basis of measurements of angular momentum, streaming motions, tumbling, and velocity ellipsoids of the dark halos. The alignment of the angular momentum is argued to originate from the alignment of the linear regime torque acting on a triaxial density perturbation. The origin of the tendency for the small misalignment angle between the rotation vector and the apparent minor axis in elliptical galaxies is due to this effect. Tidal torques are found to isotropize the velocity ellipsoids of dark halos at large radii in some cases.
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