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Eight ultra-faint galaxy candidates discovered in year two the Dark Energy Survey

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Eight ultra-faint galaxy candidates discovered in year two the Dark Energy Survey

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Título Eight ultra-faint galaxy candidates discovered in year two the Dark Energy Survey
Autor Drlica-Wagner, Alex
Bechtol, Keith
Rykoff, Eli
Luque Canaza, Elmer Fidel
Queiroz, Anna Bárbara de Andrade
Mao, Yao-Yuan
Wechsler, Risa H.
Simon, Josh D.
Santiago, Basilio Xavier
Yanny, Brian
Balbinot, Eduardo
Dodelson, Scott
Fausti Neto, Angelo
James, David J.
Li, T. S.
Maia, Marcio Antonio Geimba
Marshall, Jennifer L.
Pieres, Adriano
Stringer, Katelyn M.
Walker, Alistair
Abbott, Timothy M. C.
Abdalla, Filipe B.
Allam, Sahar S.
Benoit-Lévy, Aurélien
Bernstein, Rebecca A.
Bernstein, Gary M.
Bertin, Emmanuel
Brooks, D.
Buckley-Geer, Elizabeth
Burke, David Lyle
Carnero Rosell, Aurelio
Carrasco Kind, Matías
Carretero Palacios, Jorge
Crocce, Martin
Costa, Luiz N. da
Desai, S.
Diehl, H. Thomas
Dietrich, Jörg P.
Doel, Peter
Eifler, Tim
Evrard, August E.
Flaugher, Brenna
Fosalba Vela, Pablo
Frieman, Joshua A.
Gaztañaga, Enrique
Gerdes, David W.
Gruen, Daniel
Gruendl, Robert A.
Gutierrez, Gaston R.
Honscheid, K.
Kuehn, Kyler
Kuropatkin, Nikolay P.
Lahav, Ofer
Miquel, Ramon
Nord, Brian Dennis
Ogando, Ricardo L.C.
Plazas Malagón, Andrés Alejandro
Reil, Kevin
Roodman, Aaron
Sako, Masao
Sanchez-Alvaro, Eusebio
Scarpine, Victor Emanuel
Schubnell, Michael
Sevilla, Ignacio
Smith, Robert Christopher
Soares-Santos, Marcelle
Sobreira, Flávia
Suchyta, Eric
Swanson, Molly E. C.
Tarle, Gregory
Tucker, Douglas L.
Vikram, Vinu
Wester, William Carl
Zhang, Y.
Zuntz, J.
DES Collaboration
Abstract We report the discovery of eight new ultra-faint dwarf galaxy candidates in the second year of optical imaging data from the Dark Energy Survey (DES). Six of these candidates are detected at high confidence, while two lowerconfidence candidates are identified in regions of non-uniform survey coverage. The new stellar systems are found by three independent automated search techniques and are identified as overdensities of stars, consistent with the isochrone and luminosity function of an old and metal-poor simple stellar population. The new systems are faint (MV > −4.7mag) and span a range of physical sizes (17 pc < r1/2 < 181 pc) and heliocentric distances (25 kpc < De < 214 kpc). All of the new systems have central surface brightnesses consistent with known ultrafaint dwarf galaxies (μ  27.5mag arcsec−2). Roughly half of the DES candidates are more distant, less luminous, and/or have lower surface brightnesses than previously known Milky Way satellite galaxies. Most of the candidates are found in the southern part of the DES footprint close to the Magellanic Clouds. We find that the DES data alone exclude (p < 10−3) a spatially isotropic distribution of Milky Way satellites and that the observed distribution can be well, though not uniquely, described by an association between several of the DES satellites and the Magellanic system. Our model predicts that the full sky may hold ∼100 ultra-faint galaxies with physical properties comparable to the DES satellites and that 20%–30% of these would be spatially associated with the Magellanic Clouds.
Contido em The astrophysical journal. Bristol. Vol. 813, no. 2 (Nov. 2016), 109, 20 p.
Assunto Galaxias
Via láctea
[en] Galaxies: dwarf
[en] Local group
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/140479
Arquivos Descrição Formato
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