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Title:
Velocity Dispersion Profiles of Seven Dwarf Spheroidal Galaxies
Authors:
Walker, Matthew G.; Mateo, Mario; Olszewski, Edward W.; Gnedin, Oleg Y.; Wang, Xiao; Sen, Bodhisattva; Woodroofe, Michael
Affiliation:
AA(Department of Astronomy, University of Michigan, Ann Arbor, MI 48109.), AB(Department of Astronomy, University of Michigan, Ann Arbor, MI 48109.), AC(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AD(Department of Astronomy, University of Michigan, Ann Arbor, MI 48109.), AE(Department of Mathematics and Statistics, University of Maryland, Baltimore County, Baltimore, MD 21250.), AF(Department of Statistics, University of Michigan, Ann Arbor, MI 48109.), AG(Department of Statistics, University of Michigan, Ann Arbor, MI 48109.)
Publication:
The Astrophysical Journal, Volume 667, Issue 1, pp. L53-L56. (ApJL Homepage)
Publication Date:
09/2007
Origin:
UCP
ApJ Keywords:
Cosmology: Dark Matter, Galaxies: Dwarf, Galaxies: Kinematics and Dynamics, Galaxies: Local Group, Techniques: Radial Velocities
DOI:
10.1086/521998
Bibliographic Code:
2007ApJ...667L..53W

Abstract

We present stellar velocity dispersion profiles for seven Milky Way dwarf spheroidal (dSph) satellite galaxies. We have measured 8394 line-of-sight velocities (+/-2.5 km s-1) for 6804 stars from high-resolution spectra obtained at the Magellan and MMT telescopes. We combine these new data with previously published velocities to obtain the largest available kinematic samples, which include more than 5500 dSph members. All the measured dSphs have stellar velocity dispersion of order 10 km s-1 that remains approximately constant with distance from the dSph center, out to and in some cases beyond the radius at which the mean surface brightness falls to the background level. Assuming dSphs reside within dark matter halos characterized by the NFW density profile, we obtain reasonable fits to the empirical velocity dispersion profiles. These fits imply that, among the seven dSphs, Mvir~108-109 Msolar. The mass enclosed at a radius of 600 pc, the region common to all data sets, lies in the range (2-7)×107 Msolar.

This paper includes data gathered with the 6.5 m Magellan Telescopes at Las Campanas Observatory, Chile, and with the 6.5 m MMT telescope.

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