The GALAH Survey: Chemically tagging the Fimbulthul stream to the globular cluster ω Centauri
Article
Article Title | The GALAH Survey: Chemically tagging the Fimbulthul stream to the globular cluster ω Centauri |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Simpson, Jeffrey D. (Author), Martell, Sarah L. (Author), Da Costa, Gary (Author), Horner, Jonathan (Author), Wyse, Rosemary F. G. (Author), Ting, Yuan-Sen (Author), Asplund, Martin (Author), Bland-Hawthorn, Joss (Author), Buder, Sven (Author), de Silva, Gayandhi M. (Author), Freeman, Ken C. (Author), Kos, Janez (Author), Lewis, Geraint F. (Author), Lind, Karin (Author), Sharma, Sanjib (Author), Zucker, Daniel B. (Author), Zwitter, Tomaz (Author), Cotar, Klemen (Author), Cottrell, Peter L. (Author) and Nordlander, Thomas (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 491 (3), pp. 3374-3384 |
Number of Pages | 11 |
Year | 2020 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stz3105 |
Web Address (URL) | https://academic.oup.com/mnras/article/491/3/3374/5613398 |
Abstract | Using kinematics from Gaia and the large elemental abundance space of the second data release of the GALAH survey, we identify two new members of the Fimbulthul stellar stream, and chemically tag them to massive, multimetallic globular cluster ω Centauri. Recent analysis of the second data release of Gaia had revealed the Fimbulthul stellar stream in the halo of the Milky Way. It had been proposed that the stream is associated with the ω Cen, but this proposition relied exclusively upon the kinematics and metallicities of the stars to make the association. In this work, we find our two new members of the stream to be metal-poor stars that are enhanced in sodium and aluminium, typical of second population globular cluster stars, but not otherwise seen in field stars. Furthermore, the stars share the s-process abundance pattern seen in ω Cen, which is rare in field stars. Apart from one star within 1.5 deg of ω Cen, we find no other stars observed by GALAH spatially near ω Cen or the Fimbulthul stream that could be kinematically and chemically linked to the cluster. Chemically tagging stars in the Fimbulthul stream to ω Cen confirms the earlier work, and further links this tidal feature in the Milky Way halo to ω Cen. |
Keywords | globular clusters: individual: ω Cen; galaxy: halo; galaxy: kinematics and dynamics; Astrophysics - Astrophysics of Galaxies |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of New South Wales |
Australian National University | |
Centre for Astrophysics | |
Johns Hopkins University, United States | |
Institute for Advanced Study, United States | |
University of Sydney | |
Max Planck Society, Germany | |
Macquarie University | |
University of Ljubljana, Slovenia | |
Uppsala University, Sweden | |
Monash University |
https://research.usq.edu.au/item/q5x12/the-galah-survey-chemically-tagging-the-fimbulthul-stream-to-the-globular-cluster-centauri
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