A Deeper Look at DES Dwarf Galaxy Candidates: Grus i and Indus ii

  title={A Deeper Look at DES Dwarf Galaxy Candidates: Grus i and Indus ii},
  author={Sarah A. Cantu and Andrew B. Pace and Jennifer L. Marshall and Louis E. Strigari and Denija Crnojevi{\'c} and Joshua D. Simon and Alex Drlica-Wagner and Keith C. Bechtol and Clara E. Mart'inez-V'azquez and Bas{\'i}lio Xavier Santiago and Adam Amara and K. M. Stringer and H. Thomas Diehl and Michel Aguena and Sahar Allam and Santiago {\'A}vila and David Brooks and A. Carnero Rosell and Matias Carrasco Kind and Jorge Carretero and M. Costanzi and L. N. da Costa and Juan Carlos de Vicente and Shantanu Desai and Peter Doel and T. F. Eifler and S. Everett and Joshua A. Frieman and Juan Garc{\'i}a-Bellido and Enrique Gazta{\~n}aga and Daniel Gruen and Robert A. Gruendl and Julia Gschwend and Gaston R. Guti{\'e}rrez and Samuel R. Hinton and Devon L. Hollowood and Klaus Honscheid and David J. James and Kyler W. Kuehn and Marcio A. G. Maia and Felipe Menanteau and Ramon Miquel and Antonella Palmese and Francisco Paz-Chinch{\'o}n and Andreas Alejandro Plazas and E. Sanchez and Victor E. Scarpine and Michael S. Schubnell and Santiago Serrano and Ignacio Sevilla-Noarbe and M. Smith and Marcelle Soares-Santos and Eric Suchyta and Mollye E. C. Swanson and Gregory G. Tarl{\'e} and Alistair R. Walker and R. D. Wilkinson},
  journal={The Astrophysical Journal},
We present deep g- and r-band Magellan/Megacam photometry of two dwarf galaxy candidates discovered in the Dark Energy Survey (DES), Grus i and Indus ii (DES J2038–4609). For the case of Grus i, we resolved the main sequence turn-off (MSTO) and ∼2 mags below it. The MSTO can be seen at g 0 ∼ 24 with a photometric uncertainty of 0.03 mag. We show Grus i to be consistent with an old, metal-poor (∼13.3 Gyr, [Fe/H] ∼ −1.9) dwarf galaxy. We derive updated distance and structural parameters for Grus… 


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