Computer Science – Numerical Analysis
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46..319u&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 4, p. 319-333
Computer Science
Numerical Analysis
15
Angular Momentum, Astronomical Models, Cosmology, Dark Matter, Galactic Clusters, Galactic Halos, Many Body Problem, Universe, Velocity, Computerized Simulation, Galactic Evolution, Gravitation, Numerical Analysis
Scientific paper
We have studied the velocity functions and angular momentum distribution of halos and clusters identified from large N-body simulations in spatially flat cold dark-matter (CDM) universes. They were compared with previous numerical results in much lower spatial resolution or with an analytic prediction based on the Press-Schecter theory. We found that although our simulations reproduce the velocity functions in reasonable agreement with the Press-Schechter theory, there exists a small, but systematic, deviation from the formula, particularly for low-density CDM models. Quantitative comparison of our velocity functions with the available observational data revealed that only the standard CDM model with a high biasing parameter of b approx. 2 is consistent with the observation; other CDM models, especially low-density variants, are in conflict. The distribution of the dimensionless angular momentum (lambda) is very broad, lambda greater than or approximately equal to 0.01 and less than or approximately equal to 0.1, and the functional form of the distribution looks very universal, and is quite insensitive to both the cosmological parameters and the fluctuation spectrum shape. Although the spatial distribution of the angular momentum does not show any noticeable correlation of the orientation, halos with relatively small lambda preferentially cluster around dense regions, which can be interpreted to be consistent with the observed morphology-density relation of galaxies.
Shimasaku Kazuhiro
Suginohara Tatsushi
Suto Yasushi
Ueda Haruhiko
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