The Gaia-ESO survey: A quiescent milky way with no significant dark/stellar accreted disc
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Archivos
Fecha
2015-07
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Oxford University Press
Nombre de Curso
Licencia CC
Atribución 4.0 Internacional (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
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.
Notas
Indexación: Scopus
Palabras clave
Galaxy, disc, Galaxy, evolution, Galaxy, formation, Stars, abundances, Stars, kinematics and dynamics, Surveys
Citación
Monthly Notices of the Royal Astronomical Society Volume 450, Issue 3, Pages 2874 - 28871 July 2015
DOI
10.1093/mnras/stv807