Statistics – Computation
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1089b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, April 1992, p. 1089-1106.
Statistics
Computation
39
Galactic Mass, Galactic Structure, Interacting Galaxies, Spiral Galaxies, Computational Astrophysics, Computerized Simulation, Disk Galaxies, Galactic Rotation, Perturbation Theory, Tides
Scientific paper
Numerical studies of the tidal interactions between galaxies are examined to determine whether the results are applicable to the majority of normal spirals. Attention is given to the frequency of the tidal generation of spiral patterns and to the possibility of their formation over an entire disk. Self-gravitating computer simulations are employed to determine: (1) the minimum mass for a perturber that generates a global spiral pattern; and (2) the relationship between the number and closeness of the perturbers to expected arm lifetime. Numerical simulations demonstrate the short-term 'signatures' of the arm-formation process, and disk patterns are described that are generated by companions too small to elicit global grand design patterns. The stages and processes related to tidal arms and spiral galaxies are described in detail and compared to observational data that yield optical evidence and other support for the present descriptions.
Byrd Gene Gilbert
Howard Sethanne
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