Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 450, Issue 3, Pages 2874-2887Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv807
Keywords
surveys; stars: abundances; stars: kinematics and dynamics; Galaxy: disc; Galaxy: evolution; Galaxy: formation
Categories
Funding
- project grant 'The New Milky Way' from the Knut and Alice Wallenberg Foundation
- SNF [PP00P2_128540/1]
- MINECO [ESP2013-41268-R]
- Generalitat of Catalunya [2014SGR-1458]
- European Union FP7-PEOPLE-IEF grant [328098]
- Swedish National Space Board (SNSB/Rymdstyrelsen)
- Chile's Ministry of Economy, Development, and Tourism's Millennium Science Initiative [IC120009]
- European Union FP7 programme through ERC [320360]
- Leverhulme Trust [RPG-2012-541]
- INAF
- Ministero dell' Istruzione, dell' Universita' e della Ricerca (MIUR)
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According to our current cosmological model, galaxies like the Milky Way are expected to experience many mergers over their lifetimes. The most massive of the merging galaxies will be dragged towards the disc plane, depositing stars and dark matter into an accreted disc structure. In this work, we utilize the chemodynamical template developed in Ruchti et al. to hunt for accreted stars. We apply the template to a sample of 4675 stars in the third internal data release from the Gaia-ESO Spectroscopic Survey. We find a significant component of accreted halo stars, but find no evidence of an accreted disc component. This suggests that the Milky Way has had a rather quiescent merger history since its disc formed some 8-10 billion years ago and therefore possesses no significant dark matter disc.
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