Tidal change in the energy of a spherical galaxy
Abstract
Tidal effects of a massive perturber on a satellite galaxy have been studied by numerical simulations. The model consists of a spherical satellite galaxy and a pointmass perturber and the encounter is non penetrating. A wide range of density ratios and eccentricities of the orbit have been used. The disruption of the satellite galaxy has been greater than two. The energy change shows smooth variation with time in the case of unbound orbits and irregular variation in the bound orbit cases. It is shown that, for a constant pericentric distance, increasing the density ratio decreases the tidal effects, and for a given density ratio an increase in the eccentricity decreases the tidal effects. Nbody results are compared with predictions of analytical estimates.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 March 1990
 Bibcode:
 1990MNRAS.243..276N
 Keywords:

 Astronomical Models;
 Computational Astrophysics;
 Galactic Structure;
 Gravitational Effects;
 Interacting Galaxies;
 Energy Transfer;
 Galactic Mass;
 Many Body Problem;
 Orbital Mechanics;
 Perturbation Theory;
 Astrophysics