Two Ultra-faint Milky Way Stellar Systems Discovered in Early Data from the DECam Local Volume Exploration Survey

@article{Mau2019TwoUM,
  title={Two Ultra-faint Milky Way Stellar Systems Discovered in Early Data from the DECam Local Volume Exploration Survey},
  author={S. Mau and William Cerny and Andrew B. Pace and Y. Choi and Alex Drlica-Wagner and Luidhy Santana-Silva and Alexander H Riley and Denis Erkal and Guy S. Stringfellow and Monika Adam'ow and Jeffrey L. Carlin and Robert A. Gruendl and D. Hernandez-Lang and N. Kuropatkin and T. S. Li and Clara E. Mart'inez-V'azquez and E. Morganson and Burçin Mutlu-Pakdil and Eric H. Neilsen and David L. Nidever and Knut A. G. Olsen and David J. Sand and Erik J. Tollerud and Douglas L. Tucker and Brian Yanny and A. Zenteno and Sahar Allam and Wayne A. Barkhouse and Keith C. Bechtol and Eric F. Bell and P. Balaji and Denija Crnojevi'c and J. Esteves and P. S. Ferguson and Carme Gallart and Allison K. Hughes and David J. James and P. Jethwa and L. Clifton Johnson and Kyler W. Kuehn and Steven R. Majewski and Y.-Y. Mao and Pol Massana and M. McNanna and Antonela Monachesi and Ethan O. Nadler and Noelia E. D. No{\"e}l and Antonella Palmese and Francisco Paz-Chinch{\'o}n and A. Pieres and J. S{\'a}nchez and N. Shipp and Joshua D. Simon and Marcelle Soares-Santos and Kiyan Tavangar and Roeland P. van der Marel and Anna Katherina Vivas and Alistair R. Walker and Risa H. Wechsler},
  journal={arXiv: Astrophysics of Galaxies},
  year={2019}
}
We report the discovery of two ultra-faint stellar systems found in early data from the DECam Local Volume Exploration survey (DELVE). The first system, Centaurus I (DELVE J1238-4054), is identified as a resolved overdensity of old and metal-poor stars with a heliocentric distance of ${\rm D}_{\odot} = 116.3_{-0.6}^{+0.6}$ kpc, a half-light radius of $r_h = 2.3_{-0.3}^{+0.4}$ arcmin, an age of $\tau > 12.85$ Gyr, a metallicity of $Z = 0.0002_{-0.0002}^{+0.0001}$, and an absolute magnitude of… 

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