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The GALAH Survey: Chemically tagging the Fimbulthul stream to the globular cluster omega Centauri
UNSW, Sch Phys, Sydney, NSW 2052, Australia.
UNSW, Sch Phys, Sydney, NSW 2052, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia.
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia.
Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia.
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2020 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 491, no 3, p. 3374-3384Article in journal (Refereed) Published
Abstract [en]

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 omega 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 omega 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 omega Cen, which is rare in field stars. Apart from one star within 1.5 deg of omega Cen, we find no other stars observed by GALAH spatially near omega Cen or the Fimbulthul stream that could be kinematically and chemically linked to the cluster. Chemically tagging stars in the Fimbulthul stream to omega Cen confirms the earlier work, and further links this tidal feature in the Milky Way halo to omega Cen.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2020. Vol. 491, no 3, p. 3374-3384
Keywords [en]
globular clusters: individual: omega Cen, galaxy: halo, galaxy: kinematics and dynamics
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-406909DOI: 10.1093/mnras/stz3105ISI: 000512306500020OAI: oai:DiVA.org:uu-406909DiVA, id: diva2:1415969
Available from: 2020-03-20 Created: 2020-03-20 Last updated: 2020-03-20Bibliographically approved

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Lind, Karin

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