STELLAR KINEMATICS AND METALLICITIES IN THE ULTRA-FAINT DWARF GALAXY RETICULUM II

@article{Simon2015STELLARKA,
  title={STELLAR KINEMATICS AND METALLICITIES IN THE ULTRA-FAINT DWARF GALAXY RETICULUM II},
  author={Joshua D. Simon and Alex Drlica-Wagner and T. S. Li and Brian Nord and Marla C. Geha and Keith C. Bechtol and Eduardo Balbinot and Elizabeth Buckley-Geer and H. Lin and Jennifer L. Marshall and Bas{\'i}lio Xavier Santiago and Louis E. Strigari and M. Y. Wang and Risa H. Wechsler and Brian Yanny and T. D. Abbott and Anne H. Bauer and Gary M. Bernstein and Emmanuel Bertin and David Brooks and David L. Burke and Diego Capozzi and Aurelio Carnero Rosell and Matias Carrasco Kind and Chris D'Andrea and Luiz Nicolaci da Costa and Darren Lee Depoy and Shantanu Desai and H. Thomas Diehl and Scott Dodelson and Carlos E. Cunha and Juan Estrada and August E. Evrard and Angelo Fausti Neto and Eduardo B. Fernandez and David A. Finley and Brenna L. Flaugher and Joshua A. Frieman and Enrique Gazta{\~n}aga and David W. Gerdes and Daniel Gruen and Robert A. Gruendl and Klaus Honscheid and David J. James and Stephen Kent and Kyler W. Kuehn and Nikolay Kuropatkin and Ofer Lahav and Marcio A. G. Maia and M March and Paul Martini and C. J. Miller and Ramon Miquel and R. L. C. Ogando and A. K. Romer and Aaron Roodman and Eli S. Rykoff and Masao Sako and Eusebio S{\'a}nchez and Michael S. Schubnell and Ignacio Sevilla and R. C. Smith and Marcelle Soares-Santos and Flavia Sobreira and Eric Suchyta and Mollye E. C. Swanson and Gregory G. Tarl{\'e} and Jon J. Thaler and Douglas L. Tucker and Vinu Vikram and Alistair R. Walker and William C. Wester},
  journal={The Astrophysical Journal},
  year={2015},
  volume={808}
}
We present Magellan/M2FS, Very Large Telescope/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 Energy Survey imaging, we measure a mean heliocentric velocity of 62.8 ± 0.5 km s − 1 ?> and a velocity dispersion of 3.3 ± 0.7 km s − 1 ?> . The mass-to-light ratio of Ret II within its half-light radius is 470 ± 210 M ⊙ / L ⊙ ?> , demonstrating that it is a strongly dark matter… 
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