Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2024-12-12T08:26:23.067Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Aaronson, M. 1983, ApJ, 266, L11.Google Scholar
Irwin, M., Hatzidimitriou, D. 1995, MNRAS, 277, 1354.Google Scholar
King, I.R. 1966, AJ, 71, 64.CrossRefGoogle Scholar
Richstone, D.O., Tremaine, S. 1986, AJ, 92, 72.Google Scholar
Wilkinson, M.I., Kleyna, N.W., Evans, N.W., Gilmore, G. 2002, MNRAS, 330, 778.CrossRefGoogle Scholar