Farthest Neighbor: The Distant Milky Way Satellite Eridanus II*

@article{Li2016FarthestNT,
  title={Farthest Neighbor: The Distant Milky Way Satellite Eridanus II*},
  author={T. Li and J. Simon and A. Drlica-Wagner and K. Bechtol and M. Wang and J. Garc'ia-Bellido and J. Frieman and J. Marshall and D. James and L. Strigari and A. Pace and E. Balbinot and Y. Zhang and T. Abbott and S. Allam and A. Benoit-L{\'e}vy and G. Bernstein and E. Bertin and D. Brooks and D. Burke and A. Rosell and M. Kind and J. Carretero and C. Cunha and C. D'Andrea and L. Costa and D. Depoy and S. Desai and H. Diehl and T. Eifler and B. Flaugher and D. Goldstein and D. Gruen and R. Gruendl and J. Gschwend and G. Guti{\'e}rrez and E. Krause and K. Kuehn and H. Lin and M. Maia and M. March and F. Menanteau and R. Miquel and A. Plazas and A. Romer and E. S{\'a}nchez and B. Santiago and M. Schubnell and I. Sevilla-Noarbe and R. Smith and F. Sobreira and E. Suchyta and G. Tarl{\'e} and D. Thomas and D. Tucker and A. Walker and R. Wechsler and W. Wester and B. Yanny},
  journal={The Astrophysical Journal},
  year={2016},
  volume={838},
  pages={8}
}
We present Magellan/IMACS spectroscopy of the recently discovered Milky Way satellite Eridanus II (Eri II). We identify 28 member stars in Eri II, from which we measure a systemic radial velocity of nu(hel)= 75.6 +/- 1.3(stat.) +/- 2.0 (sys.) km s(-1) and a velocity dispersion of 6.9(-0.9)(+1.2) km s(-1). Assuming that Eri. II is a dispersion-supported system in dynamical equilibrium, we derive a mass within the half-light radius of 1.2(-0.3)(+0.4) x 10(7) M-circle dot, indicating a mass… Expand
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