The Gaia-ESO survey: A quiescent milky way with no significant dark/stellar accreted disc
No Thumbnail Available
Files
Date
2015-07
Profesor/a GuÃa
Facultad/escuela
Idioma
en
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Nombre de Curso
item.page.dc.rights
Atribución 4.0 Internacional (CC BY 4.0)
item.page.dc.rights
https://creativecommons.org/licenses/by/4.0/deed.es
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. © 2015 The Authors.
item.page.dc.description
Indexación: Scopus
Keywords
Galaxy, disc, Galaxy, evolution, Galaxy, formation, Stars, abundances, Stars, kinematics and dynamics, Surveys
Citation
Monthly Notices of the Royal Astronomical Society Volume 450, Issue 3, Pages 2874 - 28871 July 2015
DOI
10.1093/mnras/stv807