How faithful are N-body simulations of disc galaxies? – artificial suppression of dynamical instabilities
نویسندگان
چکیده
منابع مشابه
How Faithful Are N - Body Simulations of Disc Galaxies
1. I n t r o d u c t i o n N-body simulations employing particle-mesh codes have nowadays become a very powerful tool for investigating the dynamics of disc galaxies. In particular, two-dimensional N-body models in which the stars and the cold interstellar gas are treated as two different components have successfully been applied in studies of spiral structure (e.g., Salo 1991; Thomasson 1991)....
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Disc galaxies can be substantially modified by close encounters and mergers, since their discs are very responsive components. Close interactions can be held responsible for the formation of bridges and tails, as well as for the formation of some bars, asymmetries and grand design spirals. Bound clumps can form in the tails, due to self-gravity, and could evolve to dwarf galaxies. Off-centering...
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Two questions that naturally arise in N -body simulations of stellar systems are: 1. How can we compare experiments that employ different types of softened gravity? 2. Given a particular type of softened gravity, which choices of the softening length optimize the faithfulness of the experiments to the Newtonian dynamics? We devise a method for exploring the dynamical effects of softening, which...
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We demonstrate that the chaotic nature of N -body systems can lead to macroscopic variations in the evolution of collisionless simulations containing rotationally supported discs. The unavoidable stochasticity that afflicts all simulations generally causes mild differences between the evolution of similar models but, in order to illustrate that this is not always true, we present a case that sh...
متن کاملModelling gravity in N-body simulations of disc galaxies Optimal types of softening for given dynamical requirements
Modelling gravity is a fundamental problem that must be tackled in N -body simulations of stellar systems, and satisfactory solutions require a deep understanding of the dynamical effects of softening. In a previous paper (Romeo 1997), we have devised a method for exploring such effects, and we have focused on two applications that reveal the dynamical differences between the most representativ...
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ژورنال
عنوان ژورنال: Astronomical & Astrophysical Transactions
سال: 1995
ISSN: 1055-6796,1476-3540
DOI: 10.1080/10556799508203287