We report results from a systematic wide-area search for faint dwarf galaxies at heliocentric distances from 0.3 to 2 Mpc using the full 6 yr of data from the Dark Energy Survey (DES). Unlike previous searches over the DES data, this search specifically targeted a field population of faint galaxies located beyond the Milky Way virial radius. We derive our detection efficiency for faint, resolved dwarf galaxies in the Local Volume with a set of synthetic galaxies and expect our search to be complete to
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Abstract M V ∼ (−7, −10) mag for galaxies atD = (0.3, 2.0) Mpc. We find no new field dwarfs in the DES footprint, but we report the discovery of one high-significance candidate dwarf galaxy at a distance of , a potential satellite of the Local Volume galaxy NGC 55, separated by 47′ (physical separation as small as 30 kpc). We estimate this dwarf galaxy to have an absoluteV -band magnitude of and an azimuthally averaged physical half-light radius of , making this one of the lowest surface brightness galaxies ever found with . This is the largest, most diffuse galaxy known at this luminosity, suggesting possible tidal interactions with its host. -
Cerny, W. ; Pace, A. B. ; Drlica-Wagner, A. ; Koposov, S. E. ; Vivas, A. K. ; Mau, S. ; Riley, A. H. ; Bom, C. R. ; Carlin, J. L. ; Choi, Y. ; et al ( , The Astrophysical Journal Letters)null (Ed.)
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Drlica-Wagner, A. ; Carlin, J. L. ; Nidever, D. L. ; Ferguson, P. S. ; Kuropatkin, N. ; Adamów, M. ; Cerny, W. ; Choi, Y. ; Esteves, J. H. ; Martínez-Vázquez, C. E. ; et al ( , The Astrophysical Journal Supplement Series)null (Ed.)