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Type: Artigo
Title: The Dark Energy Survey view of the Sagittarius stream: discovery of two faint stellar system candidates
Author: Luque, E.
Pieres, A.
Santiago, B.
Yanny, B.
Vivas, A. K.
Queiroz, A.
Drlica-Wagner, A.
Morganson, E.
Balbinot, E.
Marshall, J. L.
Li, T. S.
Neto, A. F.
da Costa, L. N.
Maia, M. A. G.
Bechtol, K.
Kim, A. G.
Bernstein, G. M.
Dodelson, S.
Whiteway, L.
Diehl, H. T.
Finley, D. A.
Abbott, T.
Abdalla, F. B.
Allam, S.
Annis, J.
Benoit-Levy, A.
Bertin, E.
Brooks, D.
Burke, D. L.
Rosell, A. C.
Kind, M. C.
Carretero, J.
Cunha, C. E.
D'Andrea, C. B.
Desai, S.
Doel, P.
Evrard, A. E.
Flaugher, B.
Fosalba, P.
Gerdes, D. W.
Goldstein, D. A.
Gruen, D.
Gruendl, R. A.
Gutierrez, G.
James, D. J.
Kuehn, K.
Kuropatkin, N.
Lahav, O.
Martini, P.
Miquel, R.
Nord, B.
Ogando, R.
Plazas, A. A.
Romer, A. K.
Sanchez, E.
Scarpine, V.
Schubnell, M.
Sevilla-Noarbe, I.
Smith, R. C.
Soares-Santos, M.
Sobreira, F.
Suchyta, E.
Swanson, M. E. C.
Tarle, G.
Thomas, D.
Walker, A. R.
Abstract: We report the discovery of two new candidate stellar systems in the constellation of Cetus using the data from the first two years of the Dark E nergy Survey (DES). The objects, DES J0111-1341 and DES J0225+ 0304, are located at a heliocentric distance of -25 kpc and appear to have old and metal-poor populations. Their distances to the Sagittarius orbital plane, -1.73 kpc (DES J0111-1341) and -0.50 kpc (DES J0225+ 0304), indicate that they are possibly associated with the Sagittarius dwarf stream. The half-light radius (r(h) similar or equal to 4.55 pc) and luminosity (MV similar or equal to + 0.3) of DES J0111-1341 are consistent with it being an ultrafaint stellar cluster, while the half-light radius (rh similar or equal to 18.55 pc) and luminosity (MV similar or equal to -1.1) of DES J0225+ 0304 place it in an ambiguous region of size-luminosity space between stellar clusters and dwarf galaxies. Determinations of the characteristic parameters of the Sagittarius stream, metallicity spread (-2.18 <= [ Fe/ H] <= -0.95) and distance gradient (23 kpc <= D-circle dot <= 29 kpc), within the DES footprint in the Southern hemisphere, using the same DES data, also indicate a possible association between these systems. If these objects are confirmed through spectroscopic follow-up to be gravitationally bound systems and to share a Galactic trajectory with the Sagittarius stream, DES J0111-1341 and DES J0225+ 0304 would be the first ultrafaint stellar systems associated with the Sagittarius stream. Furthermore, DES J0225+ 0304 would also be the first confirmed case of an ultrafaint satellite of a satellite.
Subject: Galáxias anãs
Estrelas - Aglomerados
Dwarf galaxies
Stars - Clusters
Country: Reino Unido
Editor: Oxford University Press
Rights: aberto
Identifier DOI: 10.1093/mnras/stx405
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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