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The Gaia-ESO Survey: a quiescent Milky Way with no significant dark/stellar accreted disc

Ruchti, Gregory LU ; Read, J. I. ; Feltzing, Sofia LU orcid ; Serenelli, A. M. ; McMillan, Paul LU orcid ; Lind, K. ; Bensby, Thomas LU orcid ; Bergemann, M. ; Asplund, M. and Vallenari, A. , et al. (2015) In Monthly Notices of the Royal Astronomical Society 450(3). p.2874-2887
Abstract
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... (More)
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. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
surveys, stars: abundances, stars: kinematics and dynamics, Galaxy:, disc, Galaxy: evolution, Galaxy: formation
in
Monthly Notices of the Royal Astronomical Society
volume
450
issue
3
pages
2874 - 2887
publisher
Oxford University Press
external identifiers
  • wos:000356339300048
  • scopus:84930861427
ISSN
1365-2966
DOI
10.1093/mnras/stv807
project
Gaia-ESO Survey
language
English
LU publication?
yes
id
4bd80cf9-9815-46b3-9a62-a51dc8804f98 (old id 7596776)
date added to LUP
2016-04-01 10:02:08
date last changed
2024-01-06 06:08:06
@article{4bd80cf9-9815-46b3-9a62-a51dc8804f98,
  abstract     = {{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.}},
  author       = {{Ruchti, Gregory and Read, J. I. and Feltzing, Sofia and Serenelli, A. M. and McMillan, Paul and Lind, K. and Bensby, Thomas and Bergemann, M. and Asplund, M. and Vallenari, A. and Flaccomio, E. and Pancino, E. and Korn, A. J. and Recio-Blanco, A. and Bayo, A. and Carraro, G. and Costado, M. T. and Damiani, F. and Heiter, U. and Hourihane, A. and Jofre, P. and Kordopatis, G. and Lardo, C. and de Laverny, P. and Monaco, L. and Morbidelli, L. and Sbordone, L. and Worley, C. C. and Zaggia, S.}},
  issn         = {{1365-2966}},
  keywords     = {{surveys; stars: abundances; stars: kinematics and dynamics; Galaxy:; disc; Galaxy: evolution; Galaxy: formation}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{2874--2887}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{The Gaia-ESO Survey: a quiescent Milky Way with no significant dark/stellar accreted disc}},
  url          = {{http://dx.doi.org/10.1093/mnras/stv807}},
  doi          = {{10.1093/mnras/stv807}},
  volume       = {{450}},
  year         = {{2015}},
}