Issue EAS Publications Series Volume 20, 2006 Mass Profiles and Shapes of Cosmological Structures Page(s) 113 - 118 DOI 10.1051/eas:2006056 Published online 19 May 2006

Mass Profiles and Shapes of Cosmological Structures
G.A. Mamon, F. Combes, C. Deffayet and B. Fort (eds)
EAS Publications Series, 20 (2006) 113-118
DOI: 10.1051/eas:2006056

The Draco dwarf in CDM and MOND

E. Lokas¹, G. Mamon² and F. Prada<sup>3

1</sup>  Nicolaus Copernicus Astronomical Center, Warsaw, Poland
²  Institut d'Astrophysique de Paris, France
³  Instituto de Astrofísica de Andalucia, Granada, Spain

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.

© EAS, EDP Sciences 2006

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