@article{3d505767636940c3ad166d7836277347,
title = "A Search for Faint Resolved Galaxies Beyond the Milky Way in DES Year 6: A New Faint, Diffuse Dwarf Satellite of NGC 55",
abstract = "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 M V ∼ (−7, −10) mag for galaxies at D = (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 2.2 − 0.12 + 0.05 Mpc , 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 absolute V-band magnitude of − 8.0 − 0.3 + 0.5 mag and an azimuthally averaged physical half-light radius of 2.2 − 0.4 + 0.5 kpc , making this one of the lowest surface brightness galaxies ever found with μ = 32.3 mag arcsec − 2 . This is the largest, most diffuse galaxy known at this luminosity, suggesting possible tidal interactions with its host.",
author = "M. McNanna and K. Bechtol and S. Mau and Nadler, {E. O.} and J. Medoff and A. Drlica-Wagner and W. Cerny and D. Crnojevi{\'c} and B. Mutlu-Pakdıl and Vivas, {A. K.} and Pace, {A. B.} and Carlin, {J. L.} and Collins, {M. L.M.} and Ferguson, {P. S.} and D. Mart{\'i}nez-Delgado and Mart{\'i}nez-V{\'a}zquez, {C. E.} and Noel, {N. E.D.} and Riley, {A. H.} and Sand, {D. J.} and A. Smercina and E. Tollerud and Wechsler, {R. H.} and Abbott, {T. M.C.} and M. Aguena and O. Alves and D. Bacon and Bom, {C. R.} and D. Brooks and Burke, {D. L.} and Carballo-Bello, {J. A.} and {Carnero Rosell}, A. and J. Carretero and {da Costa}, {L. N.} and Davis, {T. M.} and {De Vicente}, J. and Diehl, {H. T.} and P. Doel and I. Ferrero and J. Frieman and G. Giannini and D. Gruen and G. Gutierrez and Gruendl, {R. A.} and Hinton, {S. R.} and Hollowood, {D. L.} and K. Honscheid and James, {D. J.} and K. Kuehn and Marshall, {J. L.} and J. Mena-Fern{\'a}ndez and R. Miquel and Pereira, {M. E.S.} and A. Pieres and Malag{\'o}n, {A. A.Plazas} and Sakowska, {J. D.} and E. Sanchez and {Sanchez Cid}, D. and B. Santiago and I. Sevilla-Noarbe and M. Smith and Stringfellow, {G. S.} and E. Suchyta and Swanson, {M. E.C.} and G. Tarle and N. Weaverdyck and P. Wiseman",
note = "This project used data obtained with the Dark Energy Camera (DECam), which was constructed by the Dark Energy Survey (DES) collaboration. Funding for the DES Projects has been provided by the U.S. Department of Energy, the U.S. National Science Foundation, the Ministry of Science and Education of Spain, the Science and Technology Facilities Council of the United Kingdom, the Higher Education Funding Council for England, the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign, the Kavli Institute of Cosmological Physics at the University of Chicago, the Center for Cosmology and Astro-Particle Physics at the Ohio State University, the Mitchell Institute for Fundamental Physics and Astronomy at Texas A&M University, Financiadora de Estudos e Projetos, Funda\u00E7\u00E3o Carlos Chagas Filho de Amparo \u00E0 Pesquisa do Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Cient\u00EDfico e Tecnol\u00F3gico and the Minist\u00E9rio da Ci\u00EAncia, Tecnologia e Inova\u00E7\u00E3o, the Deutsche Forschungsgemeinschaft, and the Collaborating Institutions in the Dark Energy Survey. The DES data management system is supported by the National Science Foundation under Grant Nos. AST-1138766 and AST-1536171. The DES participants from Spanish institutions are partially supported by MINECO under grants AYA2015-71825, ESP2015-66861, FPA2015-68048, SEV-2016-0588, SEV-2016-0597, and MDM-2015-0509, some of which include ERDF funds from the European Union. IFAE is partially funded by the CERCA program of the Generalitat de Catalunya. Research leading to these results has received funding from the European Research Council under the European Union\u2019s Seventh Framework Program (FP7/2007-2013) including ERC grant agreements 240672, 291329, and 306478. We acknowledge support from the Brazilian Instituto Nacional de Ci\u00EAncia e Tecnologia (INCT) e-Universe (CNPq grant 465376/2014-2). This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. The DELVE project is partially supported by Fermilab LDRD project L2019-011 and the NASA Fermi Guest Investigator Program Cycle 9 No. 91201. M.M. and K.B. acknowledge support from NSF grant AST-2009441. Research by D.C. is supported by NSF grant AST-1814208. A.B.P. is supported by NSF grant AST-1813881. J.L.C. acknowledges support from NSF grant AST-1816196. C.E.M.V. is supported by the international Gemini Observatory, a program of NSF's NOIRLab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation, on behalf of the Gemini partnership of Argentina, Brazil, Canada, Chile, the Republic of Korea, and the United States of America. D.J.S. acknowledges support from NSF grants AST-1821967 and AST-2205863. J.A.C.-B. acknowledges support from FONDECYT Regular N 1220083. Based on observations at Cerro Tololo Inter-American Observatory, NSF's National Optical-Infrared Astronomy Laboratory (2012B-0001, PI: J. Frieman; 2019A-0305, PI: A. Drlica-Wagner; and 2021B-0307, PI: K. Bechtol) which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation.",
year = "2024",
month = jan,
day = "1",
doi = "10.3847/1538-4357/ad07d0",
language = "English (US)",
volume = "961",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "American Astronomical Society",
number = "1",
}