Proper Motions, Orbits, and Tidal Influences of Milky Way Dwarf Spheroidal Galaxies

  title={Proper Motions, Orbits, and Tidal Influences of Milky Way Dwarf Spheroidal Galaxies},
  author={Andrew B. Pace and Denis Erkal and Ting S. Li},
  journal={The Astrophysical Journal},
We combine Gaia early data release 3 astrometry with accurate photometry and utilize a probabilistic mixture model to measure the systemic proper motion of 52 dwarf spheroidal (dSph) satellite galaxies of the Milky Way (MW). For the 46 dSphs with literature line-of-sight velocities we compute orbits in both a MW and a combined MW + Large Magellanic Cloud (LMC) potential and identify Car II, Car III, Hor I, Hyi I, Phx II, and Ret II as likely LMC satellites. 40% of our dSph sample has a >25… 
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