TY - JOUR
T1 - Sagittarius, a dwarf spheroidal galaxy without dark matter?
AU - Gómez-Flechoso, M. A.
AU - Fux, R.
AU - Martinet, L.
PY - 1999
Y1 - 1999
N2 - The existence of dwarf spheroidal galaxies with high internal velocity dispersions 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 the Sagittarius dwarf galaxy. We performed simulations of two kinds of N-body satellites: the first models (f-models) could correspond to satellites with high dark matter content and they represent initially isolated models. The second models (s-models) have either low or negligible dark matter content and they are constructed in a tidal field, In spite of being on the same orbits, the s-models are able to produce a better agreement with some observational constraints concerning Sagittarius. From our simulations, we can also infer that Sagittarius is in the process of being disrupted.
AB - The existence of dwarf spheroidal galaxies with high internal velocity dispersions 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 the Sagittarius dwarf galaxy. We performed simulations of two kinds of N-body satellites: the first models (f-models) could correspond to satellites with high dark matter content and they represent initially isolated models. The second models (s-models) have either low or negligible dark matter content and they are constructed in a tidal field, In spite of being on the same orbits, the s-models are able to produce a better agreement with some observational constraints concerning Sagittarius. From our simulations, we can also infer that Sagittarius is in the process of being disrupted.
KW - Galaxies: individual: sagittarius dwarf
KW - Galaxies: interactions
KW - Galaxies: local group cosmology: dark matter
KW - Methods: numerical
UR - http://www.scopus.com/inward/record.url?scp=0007064394&partnerID=8YFLogxK
M3 - Article
SN - 0004-6361
VL - 347
SP - 77
EP - 91
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 1
ER -