The Gaia-ESO survey: A quiescent milky way with no significant dark/stellar accreted disc

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 u...

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Detalles Bibliográficos
Autores: Ruchti, G. R., Read, J. I., Feltzing, S., Serenelli, Aldo, McMillan, P., Lind, K., Bensby, T., Bergemann, M., Asplund, M., Vallenari, A., Flaccomio, E., Pancino, E., Korn, A. J., Recio-Blanco, A., Bayo, A., Carraro, G., Costado, M. T., Damiani, F., Heiter, U., Hourihane, A., Jofré, P., Kordopatis, G., Lardo, C., de Laverny, P., Monaco, L., Morbidelli, L., Sbordone, L., Worley, C. C., Zaggia, S.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/391209
Acceso en línea:http://hdl.handle.net/10261/391209
Access Level:acceso abierto
Palabra clave:Surveys
Stars: abundances
Stars: kinematics and dynamics
Galaxy: disc
Galaxy: evolution
Galaxy: formation
Descripción
Sumario: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 Published by Oxford University Press on behalf of the Royal Astronomical Society.

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