Physics – Optics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..571d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 2, Dec. 1991, p. 571-582.
Physics
Optics
18
Computerized Simulation, Galactic Evolution, Spiral Galaxies, Angular Momentum, Caustics (Optics), Jacobi Matrix Method, Kinematics, Prominences
Scientific paper
The spiral patterns generated by close interactions of galaxies are considered with the aim of obtaining a more systematic understanding of the types of patterns that are formed in the early stages of galaxy interactions. On the basis of a simulated survey of direct perturbations, the most characteristic forms of transient tidal patterns during about one rotation period of the disk at the radius of closest approach of the disturber are identified. For a representative set of parameters these patterns occur in a universal sequence. It is shown that the duration of a typical encounter is short enough so that the impulse approximation is valid over a large fraction of the disk. The impulse approximation can be used to analytically calculate the positions of caustics in the disk and thus produce the characteristic patterns found in the simulations. In particular, the tidal tail is produced by two distinct mechanisms, leading in some circumstances to the formation of a double arm.
Donner Karl Johan
Engstrom S.
Sundelius Bjorn
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