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Title:
On Kinematic Substructure in the Sextans Dwarf Spheroidal Galaxy
Authors:
Walker, Matthew G.; Mateo, Mario; Olszewski, Edward W.; Pal, Jayanta Kumar; Sen, Bodhisattva; Woodroofe, Michael
Affiliation:
AA(Department of Astronomy, University of Michigan, 830 Dennison Building, Ann Arbor, MI 48109-1042.), AB(Department of Astronomy, University of Michigan, 830 Dennison Building, Ann Arbor, MI 48109-1042.), AC(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065.), AD(Department of Statistics, University of Michigan, 439 West Hall, Ann Arbor, MI 48109-1107.), AE(Department of Statistics, University of Michigan, 439 West Hall, Ann Arbor, MI 48109-1107.), AF(Department of Statistics, University of Michigan, 439 West Hall, Ann Arbor, MI 48109-1107.)
Publication:
The Astrophysical Journal, Volume 642, Issue 1, pp. L41-L44. (ApJL Homepage)
Publication Date:
05/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Dwarf, Galaxies: Individual: Name: Sextans, Galaxies: Kinematics and Dynamics, Galaxies: Local Group
DOI:
10.1086/504522
Bibliographic Code:
2006ApJ...642L..41W

Abstract

We present multifiber echelle radial velocity results for 551 stars in the Sextans dwarf spheroidal galaxy and identify 294 stars as probable Sextans members. The projected velocity dispersion profile of the binned data remains flat to a maximum angular radius of 30'. We introduce a nonparametric technique for estimating the projected velocity dispersion surface and use this to search for kinematic substructure. Our data do not confirm previous reports of a kinematically distinct stellar population at the Sextans center. Instead we detect a region near the Sextans core radius that is kinematically colder than the overall Sextans sample with 95% confidence.

Based on observations using the Magellan telescopes.

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