Dark Matter Constraints from the Sagittarius Dwarf and Tail System

Details Dark Matter Constraints from the Sagittarius Dwarf and Tail System Dark Matter Constraints from the Sagittarius Dwarf and Tail System

2003-11-23

arxiv.org/abs/astro-ph/0311522v1

Astronomy and Astrophysics

Astrophysics

6 pages, 0 figures. Contribution to proceedings of ``IAU Symposium 220: Dark Matter in Galaxies'', eds. S. Ryder, D.J. Pisano,

Scientific paper

2MASS has provided a three-dimensional map of the >360 degree, wrapped tidal tails of the Sagittarius (Sgr) dwarf spheroidal galaxy, as traced by M giant stars. With the inclusion of radial velocity data for stars along these tails, strong constraints exist for dynamical models of the Milky Way-Sgr interaction. N-body simulations of Sgr disruption with model parameters spanning a range of initial conditions (e.g., Sgr mass and orbit, Galactic rotation curve, halo flattening) are used to find parameterizations that match almost every extant observational constraint of the Sgr system. We discuss the implications of the Sgr data and models for the orbit, mass and M/L of the Sgr bound core as well as the strength, flattening, and lumpiness of the Milky Way potential.

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