Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..46..285s&link_type=abstract
Astrophysics and Space Science, vol. 46, Feb. 1977, p. 285-291.
Astronomy and Astrophysics
Astrophysics
20
Astrodynamics, Capture Effect, Collisions, Galaxies, Stellar Motions, Classifications, Density Distribution, Impact Prediction, Internal Energy, Space Density
Scientific paper
Effects of collisions between two galaxies on the test galaxy are classified as follows - Type A: changes in the size and mass of the test galaxy are both negligible; Type B: there is a significant increase in the size (at least 10%) or a decrease in the mass (at least 1%) of the test galaxy or both; Type C: the test galaxy becomes a component of a double galaxy by tidal capture; and Type D: the test galaxy is disrupted by the tidal forces of the field galaxy. The type of collision is given as a function of the distance and speed at closest approach and also as a function of the initial impact parameter and speed at infinite separation for two density models of the galaxies. Collisions in which the two galaxies do not penetrate each other are generally of type A, while slow interpenetrating collisions are generally of type B. Types C and D occur in head-on or nearly head-on collisions if the relative speed of the two galaxies is sufficiently small.
Alladin Saleh Mohamed
Sastry Shankara K.
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