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A Radial Velocity Dispersion Profile for the Fornax Dwarf Spheroidal Galaxy

Published online by Cambridge University Press:  26 May 2016

Matthew G. Walker ,
Mario Mateo ,
Edward W. Olszewski ,
Michael Woodroofe ,
Xiao Wang  and
James Joyce
Matthew G. Walker
Affiliation:
Department of Astronomy, University of Michigan, 830 Dennison Building, Ann Arbor, MI 48109-1090, USA
Mario Mateo
Affiliation:
Department of Astronomy, University of Michigan, 830 Dennison Building, Ann Arbor, MI 48109-1090, USA
Edward W. Olszewski
Affiliation:
Steward Observatory, University of Arizona, Tucson, AZ 85726, USA
Michael Woodroofe
Affiliation:
Department of Statistics, University of Michigan, 439 West Hall, Ann Arbor, MI 48109-1092, USA
Xiao Wang
Affiliation:
Department of Statistics, University of Michigan, 439 West Hall, Ann Arbor, MI 48109-1092, USA
James Joyce
Affiliation:
Department of Philosophy, University of Michigan, 435 South State St., Ann Arbor, MI 48109-1003, USA

Abstract

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We have measured precise (± 3 km/s) radial velocities for 180 stars in the Fornax dwarf spheroidal galaxy, spanning the region R=0 to just beyond the nominal tidal radius. We perform a “classical” analysis of the resulting velocity dispersion profile. A mass-follows-light King model is ruled out, while a constant velocity dispersion model remains a good fit out to the limits of our dataset. For the constant velocity dispersion case, we calculate a velocity dispersion of 11.1 ± 0.7 km/s, which implies a central M/L/[M/L]⊙ ratio of 7.6 ± 1.0.

Type
Part 11: Dwarf Galaxies
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 367 - 368
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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