Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-02-25
Mon.Not.Roy.Astron.Soc.323:529,2001
Astronomy and Astrophysics
Astrophysics
10 pages, 10 figures, MNRAS in press. High resolution Figs.8 and 10 available from http://www.strw.leidenuniv.nl/~ahelmi/sag.h
Scientific paper
10.1046/j.1365-8711.2001.04238.x
We present two simple dynamical models for Sagittarius based on N-body simulations of the progressive disruption of a satellite galaxy orbiting for 12.5 Gyr within a realistic Galactic potential. In both models the satellite initially has observable properties similar to those of current outlying dwarfs; in one case it is purely stellar while in the other it is embedded in an extended massive halo. The purely stellar progenitor is a King model with a total velocity dispersion of 18.9 km/s, a core radius of 0.44 kpc and a tidal radius of 3 kpc. The initial stellar distribution in the other case follows a King profile with the same core radius, a slightly larger total velocity dispersion and similar extent. Both these models are consistent with all published data on the current Sagittarius system, they match not only the observed properties of the main body of Sagittarius, but also those reported for unbound debris at larger distances.
Helmi Amina
White Simon D. M.
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