Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-05
Astronomy and Astrophysics
Astrophysics
9 pages, 7 figures, in "Computational astrophysics in Italy: methods and tools'', Proceedings of the workshop, Bologna, July 4
Scientific paper
A new, momentum preserving fast Poisson solver for N-body systems sharing effective O(N) computational complexity, has been recently developed by Dehnen (2000, 2002). We have implemented the proposed algorithms in a Fortran-90 code, and parallelized it by a domain decomposition using the MPI routines. The code has been applied to intensive numerical investigations of galaxy mergers, in particular focusing on the possible origin of some of the observed scaling relations of elliptical galaxies. We found that the Fundamental Plane is preserved by an equal mass merging hierarchy, while it is not in a scenario where galaxies grow by accretion of smaller stellar systems. In addition, both the Faber-Jackson and Kormendy relations are not reproduced by our simulations.
Ciotti Luca
Londrillo Pasquale
Nipoti Carlo
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