Sagittarius, a dwarf spheroidal galaxy without dark matter?

The existence of dwarf spheroidal galaxies with high internal velocity disp ersions orbiting in the Milky Way raises questions about their dark matter content and lifetime. In this paper, we present an alternative solution to the dark matter dominated satellites proposed by Ibata & Lewis (1998) for t he Sagittarius dwarf galaxy. We performed simulations of two kinds of N-bod y satellites: the first models tf-models) could correspond to satellites wi th high dark matter content and they represent initially isolated models. T he second models ts-models) either low or negligible dark matter content an d they are constructed in a tidal field. In spite of being on the same orbi ts, the s-models are able to produce a better agreement with some observati onal constraints concerning Sagittarius. From our simulations, we can also infer that Sagittarius is in the process of being disrupted.