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

G. R. Ruchti; J. I. Read; S. Feltzing; A. M. Serenelli; P. McMillan; K. Lind; T. Bensby; M. Bergemann; M. Asplund; A. Vallenari; E. Flaccomio; E. Pancino; A. J. Korn; A. Recio-Blanco; A. Bayo; G. Carraro; M. T. Costado; F. Damiani; U. Heiter; A. Hourihane; P. Jofré; G. Kordopatis; C. Lardo; P. De Laverny; L. Monaco; L. Morbidelli; L. Sbordone; C. C. Worley; S. Zaggia

doi:10.1093/mnras/stv807

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

G. R. Ruchti^*, J. I. Read, S. Feltzing, A. M. Serenelli, P. McMillan, K. Lind, T. Bensby, M. Bergemann, M. Asplund, A. Vallenari, E. Flaccomio, E. Pancino, A. J. Korn, A. Recio-Blanco, A. Bayo, G. Carraro, M. T. Costado, F. Damiani, U. Heiter, A. HourihaneP. Jofré, G. Kordopatis, C. Lardo, P. De Laverny, L. Monaco, L. Morbidelli, L. Sbordone, C. C. Worley, S. Zaggia

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

53 Citations (Scopus)

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.

Original language	English
Pages (from-to)	2874-2887
Number of pages	14
Journal	Monthly Notices of the Royal Astronomical Society
Volume	450
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stv807
Publication status	Published - 1 Jul 2015

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Ruchti, G. R., Read, J. I., Feltzing, S., Serenelli, A. M., 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., ... Zaggia, S. (2015). The Gaia-ESO survey: A quiescent milky way with no significant dark/stellar accreted disc. Monthly Notices of the Royal Astronomical Society, 450(3), 2874-2887. https://doi.org/10.1093/mnras/stv807

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

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.",

keywords = "Galaxy: disc, Galaxy: evolution, Galaxy: formation, Stars: abundances, Stars: kinematics and dynamics, Surveys",

author = "Ruchti, {G. R.} and Read, {J. I.} and S. Feltzing and Serenelli, {A. M.} and P. McMillan and K. Lind and T. Bensby and M. Bergemann and M. Asplund and A. Vallenari and E. Flaccomio and E. Pancino and Korn, {A. J.} and A. Recio-Blanco and A. Bayo and G. Carraro and Costado, {M. T.} and F. Damiani and U. Heiter and A. Hourihane and P. Jofr{\'e} and G. Kordopatis and C. Lardo and {De Laverny}, P. and L. Monaco and L. Morbidelli and L. Sbordone and Worley, {C. C.} and S. Zaggia",

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year = "2015",

month = jul,

day = "1",

doi = "10.1093/mnras/stv807",

language = "English",

volume = "450",

pages = "2874--2887",

journal = "Monthly Notices of the Royal Astronomical Society",

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Ruchti, GR, Read, JI, Feltzing, S, Serenelli, AM, McMillan, P, Lind, K, Bensby, T, Bergemann, M, Asplund, M, Vallenari, A, Flaccomio, E, Pancino, E, Korn, AJ, Recio-Blanco, A, Bayo, A, Carraro, G, Costado, MT, Damiani, F, Heiter, U, Hourihane, A, Jofré, P, Kordopatis, G, Lardo, C, De Laverny, P, Monaco, L, Morbidelli, L, Sbordone, L, Worley, CC & Zaggia, S 2015, 'The Gaia-ESO survey: A quiescent milky way with no significant dark/stellar accreted disc', Monthly Notices of the Royal Astronomical Society, vol. 450, no. 3, pp. 2874-2887. https://doi.org/10.1093/mnras/stv807

TY - JOUR

T1 - The Gaia-ESO survey

T2 - A quiescent milky way with no significant dark/stellar accreted disc

AU - Ruchti, G. R.

AU - Read, J. I.

AU - Feltzing, S.

AU - Serenelli, A. M.

AU - McMillan, P.

AU - Lind, K.

AU - Bensby, T.

AU - Bergemann, M.

AU - Asplund, M.

AU - Vallenari, A.

AU - Flaccomio, E.

AU - Pancino, E.

AU - Korn, A. J.

AU - Recio-Blanco, A.

AU - Bayo, A.

AU - Carraro, G.

AU - Costado, M. T.

AU - Damiani, F.

AU - Heiter, U.

AU - Hourihane, A.

AU - Jofré, P.

AU - Kordopatis, G.

AU - Lardo, C.

AU - De Laverny, P.

AU - Monaco, L.

AU - Morbidelli, L.

AU - Sbordone, L.

AU - Worley, C. C.

AU - Zaggia, S.

PY - 2015/7/1

Y1 - 2015/7/1

N2 - 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.

AB - 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.

KW - Galaxy: disc

KW - Galaxy: evolution

KW - Galaxy: formation

KW - Stars: abundances

KW - Stars: kinematics and dynamics

KW - Surveys

UR - http://www.scopus.com/inward/record.url?scp=84930861427&partnerID=8YFLogxK

U2 - 10.1093/mnras/stv807

DO - 10.1093/mnras/stv807

M3 - Article

SN - 0035-8711

VL - 450

SP - 2874

EP - 2887

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

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

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