Farthest Neighbor: The Distant Milky Way Satellite Eridanus II*

@article{Li2016FarthestNT,
  title={Farthest Neighbor: The Distant Milky Way Satellite Eridanus II*},
  author={T. S. Li and Joshua D. Simon and Alex Drlica-Wagner and Keith C. Bechtol and M. Y. Wang and Juan Garc'ia-Bellido and Joshua A. Frieman and Jennifer L. Marshall and David J. James and Louis E. Strigari and Andrew B. Pace and Eduardo Balbinot and Y. Zhang and Timothy M. C. Abbott and Sahar Allam and Aur{\'e}lien Benoit-L{\'e}vy and Gary M. Bernstein and Emmanuel Bertin and David Brooks and David L. Burke and Aurelio Carnero Rosell and Matias Carrasco Kind and Jorge Carretero and Carlos E. Cunha and Chris D'Andrea and Luiz Nicolaci da Costa and Darren Lee Depoy and Shantanu Desai and H. Thomas Diehl and T. F. Eifler and Brenna L. Flaugher and Daniel A. Goldstein and Daniel Gruen and Robert A. Gruendl and Julia Gschwend and Gaston R. Guti{\'e}rrez and E. Krause and Kyler W. Kuehn and H. Lin and Marcio A. G. Maia and M March and Felipe Menanteau and Ramon Miquel and Andreas Alejandro Plazas and A. K. Romer and Eusebio S{\'a}nchez and Bas{\'i}lio Xavier Santiago and Michael S. Schubnell and Ignacio Sevilla-Noarbe and R. C. Smith and Flavia Sobreira and Eric Suchyta and Gregory G. Tarl{\'e} and D. Thomas and Douglas L. Tucker and Alistair R. Walker and Risa H. Wechsler and William C. Wester and Brian 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… 
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References

SHOWING 1-10 OF 84 REFERENCES
Nearest neighbor : the low-mass Milky Way satellite Tucana III
We present Magellan/IMACS spectroscopy of the recently discovered Milky Way satellite Tucana III (Tuc III). We identify 26 member stars in Tuc III from which we measure a mean radial velocity of v
A New Faint Milky Way Satellite Discovered in the Pan-STARRS1 3π Survey
We present the discovery of a faint Milky Way satellite, Laevens 2/Triangulum II, found in the Panoramic Survey Telescope And Rapid Response System (Pan-STARRS 1) 3 pi imaging data and confirmed with
Stellar Kinematics and Metallicities in the Ultra-Faint Dwarf Galaxy Reticulum II
We present Magellan/M2FS, VLT/GIRAFFE, and Gemini South/GMOS spectroscopy of the newly discovered Milky Way satellite Reticulum II. Based on the spectra of 25 Ret II member stars selected from Dark
A Complete Spectroscopic Survey of the Milky Way Satellite Segue 1: The Darkest Galaxy
We present the results of a comprehensive Keck/DEIMOS spectroscopic survey of the ultra-faint Milky Way satellite galaxy Segue 1. We have obtained velocity measurements for 98.2% of the stars within
The Hercules Satellite: A Stellar Stream in the Milky Way Halo?
We investigate the possibility that the recently discovered Hercules Milky Way (MW) satellite is in fact a stellar stream in formation, thereby explaining its very elongated shape with an axis ratio
HOROLOGIUM II: A SECOND ULTRA-FAINT MILKY WAY SATELLITE IN THE HOROLOGIUM CONSTELLATION
We report the discovery of a new ultra-faint Milky Way satellite candidate, Horologium II (Hor II), detected in the Dark Energy Survey Y1A1 public data. Hor II features a half-light radius of pc and
A New Milky Way Satellite Discovered In The Subaru/Hyper Suprime-Cam Survey
We report the discovery of a new ultra-faint dwarf satellite companion of the Milky Way based on the early survey data from the Hyper Suprime-Cam Subaru Strategic Program. This new satellite, Virgo
Dynamical evidence for a strong tidal interaction between the Milky Way and its satellite, Leo V
We present a chemodynamical analysis of the Leo V dwarf galaxy, based on Keck II DEIMOS spectra of 8 member stars. We find a systemic velocity for the system of hvr i = 170.9 +2.1 −1.9 km s−1 , and
Eight new Milky Way companions discovered in first-year Dark Energy Survey data
We report the discovery of eight new Milky Way companions in ~1,800 deg^2 of optical imaging data collected during the first year of the Dark Energy Survey (DES). Each system is identified as a
The Kinematics of the Ultra-faint Milky Way Satellites: Solving the Missing Satellite Problem
We present Keck DEIMOS spectroscopy of stars in eight of the newly discovered ultra-faint dwarf galaxies around the Milky Way. We measure the velocity dispersions of Canes Venatici I, Canes Venatici
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