Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178..289y&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 178, Feb. 1977, p. 289-299.
Astronomy and Astrophysics
Astrophysics
12
Astronomical Models, Astrophysics, Galactic Structure, Spiral Galaxies, Stellar Systems, Center Of Gravity, Conservation Equations, Magellanic Clouds, Milky Way Galaxy, Perturbation Theory, Red Shift, Tides
Scientific paper
The possibility that binary systems of galaxies may be formed by two-body tidal encounters is investigated using a first-order perturbation theory to compute the energy transfer associated with a tidal encounter between two stellar systems containing a large number of gravitating particles of finite mass. Energy transfers experienced by the test particles during the encounter are calculated on the assumption that the relative motion of the two galaxies is described by a hyperbola, and the energy change (i.e., acceleration or deceleration) of the relative motion is determined by employing the equation of energy conservation. Consideration is given to cases of equal masses, a direct coplanar encounter, unequal masses, and various perpendicular or oblique encounters. The results show that a nearly parabolic direct coplanar encounter tends to accelerate the relative motion of the galaxies involved, that a perpendicular encounter may produce a loosely bound binary system if the relative velocities of the galaxies at a great distance are a few tens of kilometers per second, and that a binary system probably will not be formed, regardless of geometry, if the relative velocities at a great distance are as high as 50 km/sec.
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