Fig. 3

Mass-to-luminosity ratio in units of solar masses per solar luminosity as a function of absolute visual magnitude, MV. Top panel shows the dynamical mass over the absolute V-band magnitude as already described by Mateo (1998), Strigari et al. (2008a), or McConnachie (2012). Towards fainter satellite galaxies, ΥV increases, which is generally interpreted as indirect evidence for dark matter (see text for details). Bottom panel shows the ratio of the dynamical mass and the 511 keV luminosity over absolute visual magnitude. The trend is reversed when plotting Υ511 versus MV, in contradiction with what is expected for a dark matter origin. Typical error bars are shown; 2σ lower limits are shown with triangles. For comparison, ΥV and Υ511 for the Milky Way are shown with a star symbol in each panel.
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