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Motivated by the closest major merger, the Antennae Galaxies (NGC4038/4039),we want to improve our genetic algorithm based modeling code Minga (Theis1999). The aim is to reveal the major interaction and galaxy parameters, e.g.orbital information and halo properties of such an equal mass merger system.Together with the sophisticated search strategy of Minga, one needs fast andreliable models in order to investigate the high dimensional parameter space ofthis problem. Therefore we use a restricted N-body code which is based on theapproach by Toomre & Toomre (1972), however with some refinements likeconsistent orbits of extended dark matter halos. Recently also dynamicalfriction was included to this code (Petsch 2007). While a good description fordynamical friction was found for mass ratios up to q = 1/3 (Petsch & Theis2008), major merger systems were only imperfectly remodeled. Here we showrecent improvements for a major merger system by including mass-loss and usingNFW halos.

Determining properties of the Antennae system – Merging ability for restrictedN-body