•Toomre & Toomre (1972) is pretty simple, as is GALAXY based on their work.
•Most of the simulations we watched on Monday are n-body codes.
These simpler ones are three-body
codes.
•Please look at the GALAXY code to see how it works.
•All the stars are really just test particles, no self gravity, moving in the average potential of the two galaxies.
•This illustrates tidal effects very well (1/D3) but not
effects like dynamic friction (later today).