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We present Keck/DEIMOS spectroscopy of resolved stars in the M31 satellitesAnd XXVIII & And XXIX. We show that these are likely self-bound galaxies basedon 18 and 24 members in And XXVIII & And XXIX, respectively. And XXVIII has asystemic velocity of -331.1 +/- 1.8 km/s and velocity dispersion of 4.9+/-1.6km/s, implying a mass-to-light ratio (within r_1/2) of ~ 44 +/- 41. And XXIXhas a systemic velocity of -194.4 +/- 1.5 km/s and velocity dispersion of5.7+/-1.2 km/s, implying a mass-to-light ratio (within r_1/2) of ~ 124 +/- 72.The internal kinematics and implied masses of And XXVIII & And XXIX are similarto dwarf spheroidals (dSphs) of comparable luminosities, implying that theseobjects are dark matter-dominated dwarf galaxies. Despite the large projecteddistances from their host (380 and 188 kpc), the kinematics of these dSphsuggest that they are bound M31 satellites.

The Outer Limits of the M31 System: Kinematics of the Dwarf Galaxy Satellites And XXVIII and And XXIX