Resumo

NORIEGA-MENDOZA, H.  e  AGUILAR, L. A.. In situ orbit extraction from live, high precision collisions simulations of systems formed by cold collapse. Rev. mex. astron. astrofis [online]. 2018, vol.54, n.1. ISSN 0185-1101.

We performed high precision, N -body simulations of the cold collapse of initially spherical, collisionless systems using the gyrfalcon code of Dehnen (2000). The collapses produce very prolate spheroidal configurations. After the collapse, the systems are simulated for 85 and 170 half-mass radius dynamical timescales, during which energy conservation is better than 0.005%. We use this period to extract individual particle orbits directly from the simulations. We then use the taxon code of Carpintero and Aguilar (1998) to classify 1 to 1.5% of the extracted orbits from our final, relaxed configurations: less than 15% are chaotic orbits, 30% are box orbits and 60% are tube orbits (long and short axis). Our goal has been to prove that direct orbit extraction is feasible, and that there is no need to “freeze” the final N -body system configuration to extract a time-independent potential.

Palavras-chave : galaxies: kinematics and dynamics; methods: numerical.