paper

MAGI: many-component galaxy initialiser

arXiv:1712.08760 · doi:10.1093/mnras/stx3327

Abstract

Providing initial conditions is an essential procedure for numerical simulations of galaxies. The initial conditions for idealised individual galaxies in -body simulations should resemble observed galaxies and be dynamically stable for time scales much longer than their characteristic dynamical times. However, generating a galaxy model ab initio as a system in dynamical equilibrium is a difficult task, since a galaxy contains several components, including a bulge, disc, and halo. Moreover, it is desirable that the initial-condition generator be fast and easy to use. We have now developed an initial-condition generator for galactic -body simulations that satisfies these requirements. The developed generator adopts a distribution-function-based method, and it supports various kinds of density models, including custom-tabulated inputs and the presence of more than one disc. We tested the dynamical stability of systems generated by our code, representing early- and late-type galaxies, with ~2,097,152 and 8,388,608 particles, respectively, and we found that the model galaxies maintain their initial distributions for at least 1~Gyr. The execution times required to generate the two models were and seconds, respectively, which is negligible compared to typical execution times for -body simulations. The code is provided as open-source software and is publicly and freely available at \url{https://bitbucket.org/ymiki/magi}.

14 pages, 10 figures, 1 table, accepted for publication in MNRAS. The code is available at https://bitbucket.org/ymiki/magi

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