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The Draco dwarf in CDM and MOND | | Ewa L. Lokas
; Gary A. Mamon
; Francisco Prada
; | | Date: |
31 Aug 2005 | | Subject: | astro-ph | | 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 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. | | Source: | arXiv, astro-ph/0508668 | | Services: | Forum | Review | PDF | Favorites | |
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