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Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey

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Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey

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Título Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey
Autor Li, T. S.
Balbinot, Eduardo
Mondrik, Nicholas Payne
Marshall, Jennifer L.
Yanny, Brian
Bechtol, Keith
Drlica-Wagner, Alex
Oscar, Douglas Darcie
Santiago, Basilio Xavier
Simon, Josh D.
Vivas, Anna Katherina
Walker, Alistair
Wang, M.
Abbott, Timothy M. C.
Abdalla, Filipe B.
Benoit-Lévy, Aurélien
Bernstein, Gary M.
Bertin, Emmanuel
Brooks, D.
Burke, David Lyle
Carnero Rosell, Aurelio
Carretero Palacios, Jorge
Costa, Luiz N. da
DePoy, Darren L.
Desai, S.
Diehl, H. Thomas
Doel, Peter
Estrada, Juan
Finley, David A.
Flaugher, Brenna
Frieman, Joshua A.
Gruen, Daniel
Gruendl, Robert A.
Gutierrez, Gaston R.
Honscheid, K.
James, David J.
Kuehn, Kyler
Kuropatkin, Nikolay P.
Lahav, Ofer
Maia, Marcio Antonio Geimba
March, Marisa Cristina
Martini, Paul
Ogando, Ricardo L.C.
Plazas Malagón, Andrés Alejandro
Reil, Kevin
Romer, Anita K.
Roodman, Aaron
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.
Zhang, Y.
DES Collaboration
Abstract We report the discovery of an excess of main-sequence turnoff stars in the direction of the constellations of Eridanus and Phoenix from the first-year data of the Dark Energy Survey (DES). The Eridanus–Phoenix (EriPhe) overdensity is centered around l ~ 285 and b ~ -60 and spans at least 30° in longitude and 10° in latitude. The Poisson significance of the detection is at least 9s. The stellar population in the overdense region is similar in brightness and color to that of the nearby globular cluster NGC 1261, indicating that the heliocentric distance of EriPhe is about d ~ 16 kpc. The extent of EriPhe in projection is therefore at least ∼4 kpc by ∼3 kpc. On the sky, this overdensity is located between NGC 1261 and a new stellar stream discovered by DES at a similar heliocentric distance, the so-called Phoenix Stream. Given their similar distance and proximity to each other, it is possible that these three structures may be kinematically associated. Alternatively, the EriPhe overdensity is morphologically similar to the Virgo overdensity and the Hercules–Aquila cloud, which also lie at a similar Galactocentric distance. These three overdensities lie along a polar plane separated by ∼120° and may share a common origin. Spectroscopic follow-up observations of the stars in EriPhe are required to fully understand the nature of this overdensity.
Contido em The astrophysical journal. Bristol. Vol. 817, no. 2 (Feb. 2016), 135, 11 p.
Assunto Galaxias
Via láctea
[en] Galaxy: formation
[en] Galaxy: halo
[en] Galaxy: structure
[en] Local group
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/141546
Arquivos Descrição Formato
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