Mass Segregation, Relaxation, and the Coulomb Logarithm in NBody Systems
Abstract
The question of the correct choice of the Coulomb logarithm has been considered. Nbody experiments with twocomponent systems having 200, 400, and 800 heavy particles and 200 and 400 light particles have been carried out with different softening lengths in the interparticle forces. The rate of relaxation was estimated directly from the summed squared energy change of light particles per unit time. Both in magnitude and in Ndependence, the value of the upper limit on impact parameters bmax inferred from the relaxation rate is more nearly consistent with the prediction of Chandrasekhar and of Kandrup (RN exp 1/3) than that of Cohen et al. (1950). The earlier work of Farouki and Salpeter (1982), in which the contrary result was obtained, is shown to be seriously flawed.
 Publication:

The Astrophysical Journal
 Pub Date:
 October 1992
 DOI:
 10.1086/171876
 Bibcode:
 1992ApJ...398..519S
 Keywords:

 Celestial Mechanics;
 Computational Astrophysics;
 Logarithms;
 Many Body Problem;
 Molecular Relaxation;
 Numerical Integration;
 Stellar Physics;
 Astrophysics;
 CELESTIAL MECHANICS;
 STELLAR DYNAMICS;
 METHODS: NUMERICAL