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Mass Modelling of dwarf Spheroidal Galaxies

Klimentowski, Jarosław ; Łokas, Ewa L. ; Kazantzidis, Stelios ; Prada, Francisco ; Mayer, Lucio ; Mamon, Gary A.

In: Proceedings of the International Astronomical Union, 2007, vol. 3, no. S244, p. 321-325

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    Titre
    • Mass Modelling of dwarf Spheroidal Galaxies
    Auteur
    • Klimentowski, Jarosław. Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
    • Łokas, Ewa L.. Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
    • Kazantzidis, Stelios. Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics, Stanford University, P.O. Box 20450, M/S 29, Stanford, CA 94309, USA
    • Prada, Francisco. Instituto de Astrofísica de Andalucia, Apartado Correos 3005, E-18080 Granada, Spain
    • Mayer, Lucio. Institute for Theoretical Physics, University of Zürich, CH-8057 Zürich, Switzerland
    • Mamon, Gary A.. Institut d'Astrophysique de Paris (UMR 7095: CNRS and Université Pierre & Marie Curie), 98 bis Bd Arago, F-75014 Paris, France
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Proceedings of the International Astronomical Union, 2007, vol. 3, no. S244, p. 321-325. Cambridge University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:300163
    Summary
    We study the origin and properties of unbound stars in the kinematic samples of dwarf spheroidal galaxies. For this purpose we have run a high resolution N-body simulation of a two-component dwarf galaxy orbiting in a Milky Way potential. We create mock kinematic data sets by observing the dwarf in different directions. When the dwarf is observed along the tidal tails the kinematic samples are strongly contaminated by unbound stars from the tails. However, most of the unbound stars can be removed by the method of interloper rejection proposed by den Hartog & Katgert. We model the velocity dispersion profiles of the cleaned-up kinematic samples using solutions of the Jeans equation. We show that even for such a strongly stripped dwarf the Jeans analysis, when applied to cleaned samples, allows us to reproduce the mass and mass-to-light ratio of the dwarf with accuracy typically better than 25%