The Draco dwarf in CDM and MOND

Details The Draco dwarf in CDM and MOND The Draco dwarf in CDM and MOND

2005-08-31

arxiv.org/abs/astro-ph/0508668v2

EAS Publ.Ser.20:113-118,2006

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures, invited contribution to the proceedings of the XXIst IAP Colloquium "Mass Profiles and Shapes of Cosmologi

Scientific paper

10.1051/eas:2006056

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 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.

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