M51 revisited: a genetic algorithm approach of its interaction history

Details M51 revisited: a genetic algorithm approach of its interaction history M51 revisited: a genetic algorithm approach of its interaction history

2003-06-24

arxiv.org/abs/astro-ph/0306502v1

Astrophys.Space Sci.284:495-498,2003

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to appear in Proc. of "Evolution of Galaxies. III. From Simple Approaches to Self-Consistent Models", Kiel

Scientific paper

10.1023/A:1024056211087

Detailed models of observed interacting galaxies suffer from the extended parameter space. Here, we present results from our code MINGA which couples an evolutionary optimization strategy (a genetic algorithm) with a fast N-body method. MINGA allows for an automatic search of the optimal region(s) in parameter space within a few hours to a few days of CPU time on a modern PC by investigating of the order of 10^5 models. We demonstrate its applicability by modelling the HI intensity and velocity maps of the interacting system M51 and NGC 5195. We get a good fit for the HI intensity map and we can reproduce the counter-rotation feature of the HI arm. Our result corroborates the results of Salo & Laurikainen (2000) who favour a model with multiple passages through M51's disk.

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