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Eight new Milky Way companions discovered in first-year Dark Energy Survey data

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Eight new Milky Way companions discovered in first-year Dark Energy Survey data

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Título Eight new Milky Way companions discovered in first-year Dark Energy Survey data
Autor Bechtol, Keith
Drlica-Wagner, Alex
Balbinot, Eduardo
Pieres, Adriano
Simon, Josh D.
Yanny, Brian
Santiago, Basilio Xavier
Wechsler, Risa H.
Frieman, Joshua A.
Walker, Alistair
Williams, P.
Rozo, Eduardo
Rykoff, Eli
Queiroz, Anna Bárbara de Andrade
Luque Canaza, Elmer Fidel
Benoit-Lévy, Aurélien
Tucker, Douglas L.
Sevilla Noarbe, Ignacio
Gruendl, Robert A.
Costa, Luiz N. da
Fausti Neto, Angelo
Maia, Marcio Antonio Geimba
Abbott, Timothy M. C.
Allam, Sahar S.
Armstrong, Robert
Bauer, Anne Hollister
Bernstein, Gary M.
Bernstein, Rebecca A.
Bertin, Emmanuel
Brooks, D.
Buckley-Geer, Elizabeth
Burke, David Lyle
Carnero Rosell, Aurelio
Castander Serentill, Francisco Javier
Covarrubias, Ricardo A.
D'Andrea, Christopher B.
DePoy, Darren L.
Desai, S.
Diehl, H. Thomas
Eifler, Tim
Estrada, Juan
Evrard, August E.
Fernandez, Enrique
Finley, David A.
Flaugher, Brenna
Gaztañaga, Enrique
Gerdes, David W.
Girardi, Leo Alberto
Gladders, Michael David
Gruen, Daniel
Gutierrez, Gaston R.
Hao, Jiangang
Honscheid, K.
Jain, Bhuvnesh
James, David J.
Kent, Stephen M.
Kron, Richard G.
Kuehn, Kyler
Kuropatkin, Nikolay P.
Lahav, Ofer
Li, T. S.
Lin, H.
Makler, Martín
March, Marisa Cristina
Marshall, Jennifer L.
Martini, Paul
Merritt, K. Wyatt
Miller, Christopher J.
Miquel, Ramon
Mohr, Joseph J.
Neilsen, Eric H.
Nichol, Robert C.
Nord, Brian Dennis
Ogando, Ricardo L.C.
Peoples, John
Petravick, Donald L.
Plazas Malagón, Andrés Alejandro
Romer, Anita K.
Roodman, Aaron
Sako, Masao
Sanchez-Alvaro, Eusebio
Scarpine, Victor Emanuel
Schubnell, Michael
Smith, Robert Christopher
Soares-Santos, Marcelle
Sobreira, Flávia
Suchyta, Eric
Swanson, Molly E. C.
Tarle, Gregory
Thaler, Jon J.
Thomas, D.
Wester, William Carl
Zuntz, J.
DES Collaboration
Abstract We report the discovery of eight new Milky Way companions in ~1800 deg2 of optical imaging data collected during the first year of the Dark Energy Survey (DES). Each system is identified as a statistically significant overdensity of individual stars consistent with the expected isochrone and luminosity function of an old and metal-poor stellar population. The objects span a wide range of absolute magnitudes (MV from -2.2 to -7.4 mag), physical sizes (10-170 pc), and heliocentric distances (30-330 kpc). Based on the low surface brightnesses, large physical sizes, and/or large Galactocentric distances of these objects, several are likely to be new ultra-faint satellite galaxies of the Milky Way and/or Magellanic Clouds. We introduce a likelihood-based algorithm to search for and characterize stellar over-densities, as well as identify stars with high satellite membership probabilities. We also present completeness estimates for detecting ultra-faint galaxies of varying luminosities, sizes, and heliocentric distances in the first-year DES data.
Contido em The astrophysical journal. Bristol. Vol. 807, no. 1 (July 2015), 50, 16 p.
Assunto Aglomerados de galaxias
Galaxia
[en] Galaxies: dwarf
[en] Local group
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/126985
Arquivos Descrição Formato
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