# Dynamics of Galaxy Interactions

## Joshua E. Barnes

*Institute for Astronomy, University of Hawai`i,*

2680 Woodlawn Drive, Honolulu, Hawai`i 96822

Lectures given March 25 - 30, 1996, at the 26th SAAS-FEE Advanced
Course:

GALAXIES: INTERACTIONS AND INDUCED STAR FORMATION.

**Theory of Interacting Galaxies**

leading actors - collisionless dynamics - parabolic encounters -
TT models
**Numerical Stellar Dynamics**

Monte-Carlo simulation - force calculation - time integration -
errors - relaxation effects
**Studies of Tidal Encounters**

galaxy models - encounter survey - the Antennae - the Mice - M51 -
NGC 7252
**Gas Dynamics in Interacting Galaxies**

ISM dynamics - sticky & smooth particles - gas flows in
perturbed disks - star formation & feedback
**Mechanics of Merging**

dynamical friction - orbit decay - violent relaxation -
radial profiles - core radii - asymptotic structure
**Memory in Major Mergers**

fine structures - phase mixing - orbits in triaxial potentials -
survival of disk kinematics
**Dissipation & Forgetting**

hydrodynamic encounters - thermodynamic evolution -
timing of starbursts - counter-rotating components
**Accretions & Minor Mergers**

unequal-mass mergers - satellite accretions - shells & ripples -
dissipative effects: rings
**Interactions in Groups & Clusters**

group dynamics - mergers in compact groups - fast encounters -
cluster evolution

Joshua E. Barnes
(barnes@galileo.ifa.hawaii.edu)
Last modified: June 3, 1997