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Andromeda Dwarfs in Light of MOND. II. Testing Prior Predictions

  • Authors: Stacy McGaugh and Mordehai Milgrom

McGaugh & Milgrom 2013 The Astrophysical Journal 775 139.

  • Provider: AAS Journals

Caption: Figure 1.

Predicted and observed velocity dispersions of recently measured dSph satellites of M31. Each bin along the x-axis corresponds to the number of each dwarf for And XVII through And XXIX. The predictions from Paper I are shown without adjustment as circles for Upsilon * = 1 (lower points), 2 (middle points), and 4  M / L (upper points). Circles are filled if the dwarf is in the isolated regime for the assumed Upsilon * and open if it is dominated by the external field of M31. The error bars on the predictions include both observational uncertainties in the photometry and a factor of two uncertainty in Upsilon * around Upsilon * = 2  M / L . Observed velocity dispersions are taken from Tollerud et al. (2012, small squares), Tollerud et al. (2013, large squares), and Collins et al. (2013, triangles or, in the case of upper limits, horizontal bars). The number of stars used to determine each velocity dispersion is shown next to the corresponding datum. Points appear in the chronological order of their appearance in the literature from left to right within each bin. Collins et al. (2013) find that And XXVII is not in equilibrium, in contradiction to a necessary assumption of the analysis.

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