Selecting Sagittarius: Identification and chemical characterization of the Sagittarius stream
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Hyde, E.A.; Keller, Stefan; Zucker, Daniel; Ibata, Rodrigo A; Siebert, A; Lewis, G F; Penarrubia, J; Irwin, M. J.; Gilmore, G; Lane, R R
Description
Wrapping around the Milky Way, the Sagittarius stream is the dominant substructure in the halo. Our statistical selection method has allowed us to identify 106 highly likely members of the Sagittarius stream. Spectroscopic analysis of metallicity and kinematics of all members provides us with a new mapping of the Sagittarius stream. We find correspondence between the velocity distribution of stream stars and those computed for a triaxial model of the Milky Way dark matter halo. The Sagittarius...[Show more]
dc.contributor.author | Hyde, E.A. | |
---|---|---|
dc.contributor.author | Keller, Stefan | |
dc.contributor.author | Zucker, Daniel | |
dc.contributor.author | Ibata, Rodrigo A | |
dc.contributor.author | Siebert, A | |
dc.contributor.author | Lewis, G F | |
dc.contributor.author | Penarrubia, J | |
dc.contributor.author | Irwin, M. J. | |
dc.contributor.author | Gilmore, G | |
dc.contributor.author | Lane, R R | |
dc.date.accessioned | 2016-06-14T23:18:55Z | |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | http://hdl.handle.net/1885/102668 | |
dc.description.abstract | Wrapping around the Milky Way, the Sagittarius stream is the dominant substructure in the halo. Our statistical selection method has allowed us to identify 106 highly likely members of the Sagittarius stream. Spectroscopic analysis of metallicity and kinematics of all members provides us with a new mapping of the Sagittarius stream. We find correspondence between the velocity distribution of stream stars and those computed for a triaxial model of the Milky Way dark matter halo. The Sagittarius trailing arm exhibits a metallicity gradient, ranging from -0.59 to -0.97 dex over 142°. This is consistent with the scenario of tidal disruption from a progenitor dwarf galaxy that possessed an internal metallicity gradient. We note high metallicity dispersion in the leading arm, causing a lack of detectable gradient and possibly indicating orbital phase mixing. We additionally report on a potential detection of the Sextans dwarf spheroidal in our data. | |
dc.publisher | IOP Publishing | |
dc.source | Astrophysical Journal, The | |
dc.title | Selecting Sagittarius: Identification and chemical characterization of the Sagittarius stream | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 805 | |
dc.date.issued | 2015 | |
local.identifier.absfor | 020100 - ASTRONOMICAL AND SPACE SCIENCES | |
local.identifier.ariespublication | a383154xPUB2613 | |
local.type.status | Published Version | |
local.contributor.affiliation | Hyde, E.A., University of Western Sydney | |
local.contributor.affiliation | Keller, Stefan, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Zucker, Daniel, Macquarie University | |
local.contributor.affiliation | Ibata, Rodrigo A, Universite de Strasbourg | |
local.contributor.affiliation | Siebert, A, Université de Strasbourg | |
local.contributor.affiliation | Lewis, G F, School of Physics | |
local.contributor.affiliation | Penarrubia, J, University of Edinburgh | |
local.contributor.affiliation | Irwin, M. J., University of Cambridge | |
local.contributor.affiliation | Gilmore, G, University of Cambridge | |
local.contributor.affiliation | Lane, R R, Universidad de Concepcion, | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 2 | |
local.identifier.doi | 10.1088/0004-637X/805/2/189 | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
dc.date.updated | 2016-06-14T08:30:32Z | |
local.identifier.scopusID | 2-s2.0-84934883024 | |
Collections | ANU Research Publications |
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