A Deeper Look at DES Dwarf Galaxy Candidates: Grus I and Indus II

Sarah A. Cantu, Andrew B. Pace, Jennifer Marshall, Louis E. Strigari, Denija Crnojevic, Joshua D. Simon, A. Drlica-Wagner, K. Bechtol, Clara E. Martínez-Vázquez, B. Santiago, A. Amara, K. M. Stringer, H. T. Diehl, M. Aguena, S. Allam, S. Avila, D. Brooks, A. Carnero Rosell, M. Carrasco Kind, J. CarreteroM. Costanzi, L. N. da Costa, J. de Vicente, S. Desai, P. Doel, T. F. Eifler, S. Everett, J. Frieman, J. García-Bellido, E. Gaztanaga, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, K. Kuehn, M. A.G. Maia, F. Menanteau, R. Miquel, A. Palmese, F. Paz-Chinchón, A. A. Plazas, E. Sanchez, V. Scarpine, M. Schubnell, S. Serrano, I. Sevilla-Noarbe, M. Smith, M. Soares-Santos, E. Suchyta, M. E.C. Swanson, G. Tarle, A. R. Walker, R. D. Wilkinson, D. E.S. Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

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 g0 ∼ 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 I using this deep, uniform, wide-field data set. We find an azimuthally averaged half-light radius more than two times larger (∼ 151+2131 pc; ∼ 4.016+00..5474) and an absolute V -band magnitude ∼ −4.1 that is ∼ 1 magnitude brighter than previous studies. We obtain updated distance, ellipticity, and centroid parameters which are in agreement with other studies within uncertainties. Although our photometry of Indus II is ∼ 2 − 3 magnitudes deeper than the DES Y1 Public release, we find no coherent stellar population at its reported location. The original detection was located in an incomplete region of sky in the DES Y2Q1 data set and was flagged due to potential blue horizontal branch member stars. The best fit isochrone parameters are physically inconsistent with both dwarf galaxies and globular clusters. We conclude that Indus II is likely a false-positive, flagged due to a chance alignment of stars along the line of sight.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - May 13 2020

Keywords

  • Galaxies: dwarf
  • Galaxies: fundamental parameters
  • Methods: data analysis
  • Methods: statistical
  • Techniques: photometric

ASJC Scopus subject areas

  • General

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