We describe an algorithm for constructing N-body realizations of equilibrium stellar systems. The algorithm complements existing orbit-based modelling techniques using linear programming or other optimization algorithms. The equilibria are constructed by integrating an N-body system, while slowly adjusting the masses of the particles until the time-averaged density field and other observables converge to a prescribed value. The procedure can be arranged to maximize a linear combination of the entropy of the system and the chi^2 statistic for the observables. The equilibria produced may be useful as initial conditions for N-body simulations or for modelling observations of individual galaxies.
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 1996
- METHODS: NUMERICAL;
- GALAXIES: KINEMATICS AND DYNAMICS;
- 8 pages, tex, figures included, accepted by MNRAS, also available at http://www.mpa-garching.mpg.de/~syer/papers/