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The Draco dwarf in CDM and MOND

Published online by Cambridge University Press:  19 May 2006

G.A. Mamon ,
F. Combes ,
C. Deffayet ,
B. Fort ,
E. Łokas ,
G. Mamon  and
F. Prada
E. Łokas
Affiliation:
Nicolaus Copernicus Astronomical Center, Warsaw, Poland
G. Mamon
Affiliation:
Institut d'Astrophysique de Paris, France
F. Prada
Affiliation:
Instituto de Astrofísica de Andalucia, Granada, Spain
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Abstract

We present interpretations of the line-of-sight velocity distribution of stars in the Draco dwarf spheroidal galaxy in terms of CDM and MOND assuming constant mass-to-light ratio and anisotropy. We estimate the two parameters by fitting the line-of-sight velocity dispersion and kurtosis profiles for stellar samples differing by a number of stars rejected as interlopers. The results of the fitting procedure for CDM, high mass-to-light ratio (131–141 solar units in the V-band) and weakly tangential orbits, are similar for different samples, but the quality of the fit is much worse when fewer interlopers are removed. For MOND, the derived mass-to-light ratio (21 solar units) is too large to be explained by the stellar content of the galaxy.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 20: Mass Profiles and Shapes of Cosmological Structures , 2006 , pp. 113 - 118
Copyright
© EAS, EDP Sciences, 2006

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