Simulations of the formation of tidal dwarf galaxies

Details Simulations of the formation of tidal dwarf galaxies Simulations of the formation of tidal dwarf galaxies

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phdt.........2w&link_type=abstract

PhD Thesis, Combined Faculties for the Natural Sciences and for Mathematics of the University of Heidelberg, Germany. II + 142 p

Mathematics

1

Dwarf Galaxies, N-Body Simulations

Scientific paper

We present results of numerical simulations of the tidal arms in interacting systems of galaxies. The formation of new dwarf galaxies inside the tidal arms has been studied with very high resolution. We find that in pure N-body simulations, no collapsed objects are formed and that gas efficiently triggers the onset of collapse in tidal tails if the gas distribution in the progenitor disk is extended enough. Using an analysis which closely matches the procedure observers use, we determine detailed kinematical properties for the most massive object formed in the tidal tails of our simulation with gas. Numerical tools for such high resolution simulations are also presented. We have developed VINE, a new N-body SPH code for astrophysical particle simulations. The code uses a binary tree structure for the computation of gravitational interactions. It can make efficient use of the special purpose hardware GRAPE and is parallelized for shared memory supercomputers. A leapfrog and a Runge-Kutta-Fehlberg integrator have been implemented together with an individual particle time step scheme. Other implemented features include periodic boundary conditions and cosmological expansion. We present detailed parallel timings of the code.

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