2008/10/03 by Hanns P. Petsch, H.P. Petsch, Christian Theis +1
Physics and Astronomy · #Astronomy and Astrophysical Research #Dynamical friction #Galaxies: Formation, Evolution, Phenomena #Galaxy #Orbit (dynamics) #Orbital mechanics #Parameter space #Set (abstract data type) #Space (punctuation) #Stellar, planetary, and galactic studies #Work (physics) #astro-ph
paper · pdf · doi:10.1002/asna.200811079
To be published in the proceedings of the "Galactic and Stellar Dynamics 2008" conference. 4 pages, 4 figures, 2 tables
arxiv created 2008/10/03 · openalex publication_date 2008/11/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Abstract Modeling interacting galaxies to reproduce observed systems is still a challenge due to the extended parameter space (among other problems). Orbit and basic galaxy parameters can be tackled by fast simulation techniques like the restricted N‐body method, applied in the fundamental work by Toomre & Toomre (1972). This approach allows today for the study of millions of models in a short time. One difficulty for the classical restricted N‐body method is the missing orbital decay, not allowing for galaxy mergers. Here we present an extension of the restricted N‐body method including dynamical friction. This treatment has been developed by a quantitative comparison with a set of self‐consistent merger simulations. By varying the dynamical friction (formalism, strength and direction), we selected the best‐fitting parameters for a set of more than 250 000 simulations. We show that our treatment reliably reproduces the orbital decay and tidal features of merging disk galaxies for mass ratios up to q = 1/3 between host and satellite. We implemented this technique into our genetic algorithm based modeling code MINGA and present first results. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)