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Digging deeper into the Southern skies : a compact Milky Way companion discovered in first-year Dark Energy Survey data

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Digging deeper into the Southern skies : a compact Milky Way companion discovered in first-year Dark Energy Survey data

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Título Digging deeper into the Southern skies : a compact Milky Way companion discovered in first-year Dark Energy Survey data
Autor Luque Canaza, Elmer Fidel
Queiroz, Anna Bárbara de Andrade
Santiago, Basilio Xavier
Pieres, Adriano
Balbinot, Eduardo
Bechtol, Keith
Drlica-Wagner, Alex
Fausti Neto, Angelo
Costa, Luiz N. da
Maia, Marcio Antonio Geimba
Yanny, Brian
Abbott, Timothy M. C.
Allam, Sahar S.
Benoit-Lévy, Aurélien
Bertin, Emmanuel
Brooks, D.
Buckley-Geer, Elizabeth
Burke, David Lyle
Carnero Rosell, Aurelio
Carrasco Kind, Matías
Carretero Palacios, Jorge
Cunha, Carlos Eduardo
Desai, S.
Diehl, H. Thomas
Dietrich, Jörg P.
Eifler, Tim
Finley, David A.
Flaugher, Brenna
Fosalba Vela, Pablo
Frieman, Joshua A.
Gerdes, David W.
Gruen, Daniel
Gutierrez, Gaston R.
Honscheid, K.
James, David J.
Kuehn, Kyler
Kuropatkin, Nikolay P.
Lahav, Ofer
Li, T. S.
March, Marisa Cristina
Marshall, Jennifer L.
Martini, Paul
Miquel, Ramon
Neilsen, Eric H.
Nichol, Robert C.
Nord, Brian Dennis
Ogando, Ricardo L.C.
Plazas Malagón, Andrés Alejandro
Romer, Anita K.
Roodman, Aaron
Sanchez-Alvaro, Eusebio
Scarpine, Victor Emanuel
Schubnell, Michael
Sevilla Noarbe, Ignacio
Smith, Robert Christopher
Soares-Santos, Marcelle
Sobreira, Flávia
Suchyta, Eric
Swanson, Molly E. C.
Tarle, Gregory
Thaler, Jon J.
Tucker, Douglas L.
Walker, Alistair
Zhang, Y.
DES Collaboration
Abstract We use the first-year Dark Energy Survey (DES) data down to previously unprobed photometric depths to search for stellar systems in the Galactic halo, therefore complementing the previous analysis of the same data carried out by our group earlier this year. Our search is based on a matched filter algorithm that produces stellar density maps consistent with stellar population models of various ages, metallicities, and distances over the survey area. The most conspicuous density peaks in these maps have been identified automatically and ranked according to their significance and recurrence for different input models. We report the discovery of one additional stellar system besides those previously found by several authors using the same first-year DES data. The object is compact, and consistent with being dominated by an old and metal-poor population. DES 1 is found at high significance and appears in the DES images as a compact concentration of faint blue point sources. Assuming different spatial profile parameterizations, the best-fitting heliocentric distance and total absolute magnitude in the range of 77.6–87.1 kpc and −3.00 MV −2.21, respectively. The half-light radius of this object, rh ∼ 10 pc and total luminosity are consistent with it being a low-mass halo cluster. It is also found to have a very elongated shape ( ∼ 0.57). In addition, our deeper probe of DES first-year data confirms the recently reported satellite galaxy candidate Horologium II as a significant stellar overdensity. We also infer its structural properties and compare them to those reported in the literature.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 458, no. 1 (May 2016), p. 603-612
Assunto Aglomerados globulares
Energia escura
Galaxias
Mapeamentos astronômicos
[en] Galaxies: dwarf
[en] Globular clusters: general
[en] Globular clusters: individual (DES 1)
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/149058
Arquivos Descrição Formato
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