Physics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........11d&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF FLORIDA, 1995.Source: Dissertation Abstracts International, Volume: 56-11, Section: B, page: 6170
Physics
2
Smoothed Particle Hydrodynamics, Toomre Disks
Scientific paper
In this study, hierarchial tree numerical methods with a smoothed particle hydrodynamics (SPH) formalism are used to simulate galactic disk systems in two dimensions. An identification of a new axisymmetric evolution of Toomre family disks to exponential disks is made. Using two dimensional disks with gas and stellar particles to model nonmerging encounters, several scenarios are explored. By investigating the resultant gas inflows and star formation patterns, we suggest that interacting gas rich systems will have elevated gas inflow and star formation rates. In addition, a numerical study of the inclusion of counterrotating angular momentum in disk systems reveals the dynamical importance of such systems. Galaxies with significant portions of counterrotating angular momentum have been observed and, as such, a study of the properties of such systems may provide valuable information regarding the global parameters of such systems. By including counterrotating orbits, physical systems are achieved that are not possible to realize using fully direct initial conditions.
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