Statistics – Computation
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.132..177c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 132, no. 1, April 1987, p. 177-189.
Statistics
Computation
6
Collision Parameters, Computational Astrophysics, Frequency Distribution, Galactic Evolution, Galactic Structure, Ring Galaxies, Approximation, Density Distribution, Disk Galaxies, Spiral Galaxies
Scientific paper
An investigation of the expected frequency of ring galaxies is conducted in the light of the theory of their formation by the collision process involving a disk and a spherical galaxy, using the impulsive approximation. It is found that very favorable collision parameters (in terms of the impact parameter, orientation, and energy changes) are required for the formation of ring galaxies. Results indicate that if the expected frequency of fairly well-defined ring galaxies is measured with respect to regions of high density (in terms of population of galaxies) and using the average distance between galaxies corresponding to these regions for its determination, then it comes out to be of the order of 0.01 percent of spirals. In a region of normal density (where collisions are rare) for frequency determinations, the expected frequency goes down by few orders of magnitude. Thus, stray-hyperbolic encounters are too scarce to explain the formation of ring galaxies. This indicates that most of these interacting pairs must have already been bound doubles, whose orbits are such as to have brought about only now the interpenetrating encounters leading to ring formation.
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