The GALAH Survey: Chemically tagging the Fimbulthul stream to the globular cluster ω Centauri

Author:

Simpson Jeffrey D1ORCID,Martell Sarah L12ORCID,Da Costa Gary3ORCID,Horner Jonathan4,Wyse Rosemary F G5,Ting Yuan-Sen678,Asplund Martin23,Bland-Hawthorn Joss29ORCID,Buder Sven10ORCID,De Silva Gayandhi M211,Freeman Ken C3,Kos Janez912,Lewis Geraint F9ORCID,Lind Karin1013,Sharma Sanjib29ORCID,Zucker Daniel B214,Zwitter Tomaž12ORCID,Čotar Klemen12ORCID,Cottrell Peter L1516,Nordlander Thomas23ORCID

Affiliation:

1. School of Physics, UNSW, Sydney, NSW 2052, Australia

2. Centre of Excellence for Astrophysics in Three Dimensions (ASTRO-3D), Australia

3. Research School of Astronomy & Astrophysics, Australian National University, ACT 2611, Australia

4. Centre for Astrophysics, University of Southern Queensland, Toowoomba, QLD 4350, Australia

5. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA

6. Institute for Advanced Study, Princeton, NJ 08540, USA

7. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA

8. Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA

9. Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW 2006, Australia

10. Max Planck Institute for Astronomy (MPIA), Koenigstuhl 17, D-117 Heidelberg, Germany

11. Australian Astronomical Optics, Faculty of Science and Engineering, Macquarie University, Macquarie Park, NSW 2113, Australia

12. Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia

13. Department of Physics and Astronomy, Uppsala University, Box 517, SE-751 20 Uppsala, Sweden

14. Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia

15. School of Physical and Chemical Sciences, University of Canterbury, Christchurch, New Zealand

16. Monash Centre for Astrophysics, School of Physics and Astronomy, Monash University, Melbourne, Australia

Abstract

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.

Funder

European Space Agency

Australian Research Council

Slovenian Research Agency

National Aeronautics and Space Administration

Space Telescope Science Institute

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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