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Santana-Silva, M. Adam\\'ow, N. Kuropatkin, P. S. Ferguson, R. R. Munoz, S. E. Koposov, S. Mau, T. S. Li, W. Cerny, Y. Choi","submitted_at":"2021-07-19T18:00:05Z","abstract_excerpt":"We present the discovery of a candidate ultra-faint Milky Way satellite, Eridanus IV (DELVE J0505$-$0931), detected in photometric data from the DECam Local Volume Exploration survey (DELVE). Eridanus IV is a faint ($M_V = -4.7 \\pm 0.2$), extended ($r_{1/2} = 75^{+16}_{-13}$ pc), and elliptical ($\\epsilon = 0.54 \\pm 0.1$) system at a heliocentric distance of $76.7^{+4.0}_{-6.1}$ kpc, with a stellar population that is well-described by an old, metal-poor isochrone (age of $\\tau \\sim 13.0$ Gyr and metallicity of ${\\rm [Fe/H] \\lesssim -2.1}$ dex). 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B. Pace, A. Drlica-Wagner, A. H. Riley, A. K. Vivas, A. Pieres, A. Smercina, A. Zenteno, B. Mutlu-Pakdil, C. E. Mart\\'inez-V\\'azquez, C. R. Bom, D. Erkal, D. Hernandez-Lang, D. J. James, D. J. Sand, D. L. Tucker, D. Mart\\'inez-Delgado, E. J. Tollerud, G. S. Stringfellow, J. D. Sakowska, J. D. Simon, J. L. Carlin, K. A. G. Olsen, L. Santana-Silva, M. Adam\\'ow, N. Kuropatkin, P. S. Ferguson, R. R. Munoz, S. E. Koposov, S. Mau, T. S. Li, W. Cerny, Y. Choi","submitted_at":"2021-07-19T18:00:05Z","abstract_excerpt":"We present the discovery of a candidate ultra-faint Milky Way satellite, Eridanus IV (DELVE J0505$-$0931), detected in photometric data from the DECam Local Volume Exploration survey (DELVE). 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