The southern leading and trailing wraps of the Sagittarius tidal stream around the globular cluster Whiting 1
Author
dc.contributor.author
Carballo Bello, J. A.
Author
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Corral Santana, J. M.
Author
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Martínez Delgado, David
Author
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Sollima, A.
Author
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Muñoz Vidal, Ricardo Rodrigo
Author
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Cote, P.
Author
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Duffau, S.
Author
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Catelan, M.
Author
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Grebel, E. K.
Admission date
dc.date.accessioned
2018-06-26T14:36:53Z
Available date
dc.date.available
2018-06-26T14:36:53Z
Publication date
dc.date.issued
2017
Cita de ítem
dc.identifier.citation
Monthly Notices of The Royal Astronomical Society 467, L91–L95 (2017)
es_ES
Identifier
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10.1093/mnrasl/slx006
Identifier
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https://repositorio.uchile.cl/handle/2250/149228
Abstract
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We present a study of the kinematics of 101 stars observed with VIsible MultiObject Spectrograph around Whiting 1, a globular cluster embedded in the Sagittarius tidal stream. The obtained velocity distribution shows the presence of two wraps of that halo substructure at the same heliocentric distance as that of the cluster and with well-differentiated mean radial velocities. The most prominent velocity component seems to be associated with the trailing arm of Sagittarius with < v(r)> similar to-130 km s(-1), which is consistent with the velocity of Whiting 1. This result supports that this globular cluster was formed in Sagittarius and recently accreted by the Milky Way. The second component with < v(r)> similar to 120 km s(-1) might correspond to the leading arm of Sagittarius, which has been predicted by numerical simulations but with no conclusive observational evidence of its existence presented so far. This detection of the old leading wrap of Sagittarius in the Southern hemisphere may be used to confirm and further constrain the models for its orbit and evolution.
es_ES
Patrocinador
dc.description.sponsorship
CONICYT-Chile FONDECYT Postdoctoral Fellowships
3160502
3140310
Ministry for the Economy, Development, and Tourism's Programa Iniciativa Cientifica Milenio
IC120009
CONICYT's PCI program
DPI20140066
Sonderforschungsbereich 'The Milky Way System' (subproject A2) of the German Research Foundation (DFG)
SFB 881
091.D-0446