Statistics – Computation
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376l..29y&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 376, Aug. 1, 1991, p. L29-L32.
Statistics
Computation
20
Dark Matter, Galactic Evolution, Milky Way Galaxy, Astronomical Models, Computational Astrophysics, Cosmology, Hydrodynamics, Universe
Scientific paper
Galaxy formation is studied within the context of the pancake model. The collapse, cooling, and fragmentation of a massive cloud composed of baryons and collisionless dark matter in an FRW universe with omega(0) = 1, omega(b) = 0.1, and H0 = 75 km/s per Mpc is modeled using 2D numerical simulations. Perturbations having a Poisson spectrum are imposed on the cloud at the start of the calculation to provide a noise source for fragmentation. The Zeus-2D hydrodynamics code with cosmological and cooling terms is coupled to a cloud-in-cell code that evolves the dark matter. A nonuniform grid is used in the direction of collapse to resolve the central thin cooling layer. The gas cloud collapses to a pancake at redshift approximately equal to 5. It cools and undergoes instabilities causing it to fragment into protogalactic objects about 12.5 kpc, which then merge into larger objects.
Centrella Joan M.
Norman Michael L.
Yuan Wenbo
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