Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.135..131c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 135, no. 1, July 1987, p. 131-141.
Astronomy and Astrophysics
Astrophysics
13
Galactic Clusters, Galaxies, Interacting Galaxies, Formation, Gravitational Effects, Interactions, Orbits, Spiral Galaxies
Scientific paper
A study of the expected frequency of multiple interacting systems based on their interpretation as the relics of gravitational interactions between galaxies is conducted using the impulsive approximation. Results indicate that if the expected frequency of such galaxies is measured with respect to densely populated regions and using the average values of the parameters corresponding to such regions for its determination, then it comes out to be the order of 5 to 6 percent of spirals, quite compatible with observational values. But, however, if regions of normal density (where collisions are rare) are considered for frequency determinations, the expected frequency goes down by few orders of magnitude. This indicates that stray hyperbolic encounters are too scarce to explain the formation of such galaxies. Hence, 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 the formation of such peculiar systems.
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