Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-02-05
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
2 pages, 2 figures, to appear in "XIII Latin American Regional IAU Meeting" RevMexAA(SC)
Scientific paper
The evolution of a satellite galaxy of a Milky Way like galaxy has been studied using N-Body simulations. The initial satellites, containing one million particles, have been simulated by a Plummer sphere, while the potential of the host galaxy is a three component rigid potential: disc, bulge and dark matter halo. It has been found that several orbits of the satellites allow for the existence, for about 1 Gyr or more, of an out-of-equilibrium body that could be interpreted as a dSph satellite galaxy of the Milky Way. In addition, from the study of the evolution of the mass-to-light ratios of satellites that show a disrupted phase it has been found that it is possible that some dSph galaxies of the Milky Way with large M/L ratios might not be dark matter dominated and that their high mass to light ratios are observed because they are out of equilibrium objects.
Casas Rigoberto A.
Kroupa Pavel
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