publication . Article . Preprint . Other literature type . Research . 2019

Search for RR Lyrae stars in DES ultrafaint systems: Grus I, Kim 2, Phoenix II, and Grus II

S. Desai; J. De Vicente; Keith Bechtol; F. Sobreira; F. Paz-Chinchón; F. Paz-Chinchón; E. Buckley-Geer; K. M. Stringer; V. Vikram; J. D. Simon; ...
Open Access English
  • Published: 24 Sep 2019
  • Publisher: OXFORD UNIV PRESS
Abstract
This work presents the first search for RR Lyrae stars (RRLs) in four of the ultra-faint systems imaged by the Dark Energy Survey (DES) using SOAR/Goodman and Blanco/DECam imagers. We have detected two RRLs in the field of Grus I, none in Kim 2, one in Phoenix II, and four in Grus II. With the detection of these stars, we accurately determine the distance moduli for these ultra-faint dwarf satellite galaxies; $\mu_0$=20.51$\pm$0.10 mag (D$_{\odot}$=127$\pm$6 kpc) for Grus I and $\mu_0$=20.01$\pm$0.10 mag (D$_{\odot}$=100$\pm$5 kpc) for Phoenix II. These measurements are larger than previous estimations by Koposov et al. 2015 and Bechtol et al. 2015, implying lar...
Subjects
free text keywords: stars: horizontal branch, stars: variables: RR Lyrae, galaxies: dwarf, galaxies: individual (Grus I, Kim 2, Phoenix II, Grus II), stars: variables: RR Lyrae, Grus II), Phoenix II, Kim 2, galaxies: individual (Grus I, galaxies: dwarf, stars: horizontal branch, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Space and Planetary Science, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics, Estrelas, Estrelas RR Lyrae, Galáxias anãs, RR Lyrae stars, Dwarf galaxies, RR Lyrae variable, Satellite galaxy, Grus (constellation), Brightness, Astrophysics, Physics, Stars, Dwarf galaxy, Horizontal branch, Galactic halo
Funded by
NSF| Collaborative Research: The Dark Energy Survey Data Management Operations
Project
  • Funder: National Science Foundation (NSF)
  • Project Code: 1138766
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Astronomical Sciences
,
EC| COGS
Project
COGS
Capitalizing on Gravitational Shear
  • Funder: European Commission (EC)
  • Project Code: 240672
  • Funding stream: FP7 | SP2 | ERC
,
EC| TESTDE
Project
TESTDE
Testing the Dark Energy Paradigm and Measuring Neutrino Mass with the Dark Energy Survey
  • Funder: European Commission (EC)
  • Project Code: 291329
  • Funding stream: FP7 | SP2 | ERC
,
EC| COSMICDAWN
Project
COSMICDAWN
Understanding the Origin of Cosmic Structure
  • Funder: European Commission (EC)
  • Project Code: 306478
  • Funding stream: FP7 | SP2 | ERC
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