Other
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406..361u&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 2, p. 361-382.
Other
26
Cosmology, Dark Matter, Fragmentation, Galactic Evolution, Hydrodynamic Equations, Baryons, Galactic Rotation, Intergalactic Media, Nonlinear Evolution Equations
Scientific paper
Results are presented of a numerical investigation of the fragmentation of pancakes by a 3D smoothed particle hydrodynamics combined with a usual N-body scheme, where the ionization equilibria are solved and all kinds of cooling and heating processes are explicitly included for primordial gas. Consideration is given to dark-matter-dominated pancakes as well as baryon-dominated ones, in a pancake mass range of 10 exp 13 to 10 exp 15 solar masses. A three-step fragmentation scenario is found. First, the fragmentation is triggered by the filamentary mode instability in a central cooled dense layer. Second, they are torn into numerous lumps, forming chainlike structures. Finally, the lumps flow toward the outer edge, and a central hole develops. Then the lumps collide with each other and merge into larger ones. Some characteristic properties concerning galaxy formation are presented.
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