The Gaia-ESO Survey: New constraints on the Galactic disc velocity dispersion and its chemical dependencies

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The Gaia-ESO Survey : New constraints on the Galactic disc velocity dispersion and its chemical dependencies

Guiglion, G. (författare): Univ Cote Azur, Lab Lagrange, CNRS, Observ Cote Azur, F-06304 Nice 4, France.

Recio-Blanco, A. (författare): Univ Cote Azur, Lab Lagrange, CNRS, Observ Cote Azur, F-06304 Nice 4, France.

de Laverny, P. (författare): Univ Cote Azur, Lab Lagrange, CNRS, Observ Cote Azur, F-06304 Nice 4, France.

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Kordopatis, G. (författare): Leibniz Inst Astrophys Potsdam AIP, D-14482 Potsdam, Germany.

Hill, V. (författare): Univ Cote Azur, Lab Lagrange, CNRS, Observ Cote Azur, F-06304 Nice 4, France.

Mikolaitis, S. (författare): Univ Cote Azur, Lab Lagrange, CNRS, Observ Cote Azur, F-06304 Nice 4, France.

Minchev, I. (författare): Leibniz Inst Astrophys Potsdam AIP, D-14482 Potsdam, Germany.

Chiappini, C. (författare): Leibniz Inst Astrophys Potsdam AIP, D-14482 Potsdam, Germany.

Ruchti, Gregory (författare): Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science

Gilmore, G. (författare): Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England.

Randich, S. (författare): Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy.

Feltzing, Sofia (författare): Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science

Bensby, Thomas (författare): Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science

Flaccomio, E. (författare): Osserv Astron Palermo, INAF, I-90134 Palermo, Italy.

Koposov, S. E. (författare): Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England.;Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992, Russia.

Pancino, E. (författare): Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy.;ASI Sci Data Ctr, I-00133 Rome, Italy.

Bayo, A. (författare): Univ Valparaiso, Inst Fis & Astron, Valparaiso 2360102, Chile.

Costado, M. T. (författare): CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain.

Franciosini, E. (författare): Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy.

Hourihane, A. (författare): Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England.

Jofre, P. (författare): Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England.

Lardo, C. (författare): Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England.

Lewis, J. (författare): Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England.

Lind, Karin (författare): Uppsala universitet,Institutionen för fysik och astronomi

Magrini, L. (författare): Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy.

Morbidelli, L. (författare): Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy.

Sacco, G. G. (författare): Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy.

Ruchti, G. (författare): Lund Observ, Dept Astron & Theoret Phys, S-22100 Lund, Sweden.

Worley, C. C. (författare): Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England.

Zaggia, S. (författare): Padova Observ, INAF, I-35122 Padua, Italy.

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Univ Cote Azur, Lab Lagrange, CNRS, Observ Cote Azur, F-06304 Nice 4, France Leibniz Inst Astrophys Potsdam AIP, D-14482 Potsdam, Germany. (creator_code:org_t)

2015-11-02
2015
Engelska.
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 583

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Tidskriftsartikel (refereegranskat)

Abstract Ämnesord

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Context. Understanding the history and the evolution of the Milky Way is one of the main goals of modern astrophysics. In particular, the formation of the Galactic disc is a key problem of Galactic archaeology. Aims. We study the velocity dispersion behaviour of Galactic disc stars as a function of the [Mg/Fe] ratio, which for small metallicity bins can be used as a proxy of relative age. This key relation is essential to constrain the formation mechanisms of the disc stellar populations as well as the cooling and settling processes. Methods. We used the recommended parameters and chemical abundances of 7800 FGK Milky Way field stars from the second internal data release of the Gaia-ESO spectroscopic Survey. These stars were observed with the GIRAFFE spectrograph (HR10 and HR21 setups), and cover a large spatial volume in the intervals 6 < R < 10 kpc and vertical bar Z vertical bar < 2 kpc. Based on a chemical criterion, we separated the thin- from the thick-disc sequence in the [Mg/Fe] vs. [Fe/H] plane. Results. From analysing the Galactocentric velocity of the stars for the thin disc, we find a weak positive correlation between 170 and [Fe/H] that is due to a slowly rotating [Fe/H]-poor tail. For the thick disc stars, a strong correlation with [Fe/H] and [Mg/Fe] is established. In addition, we have detected an inversion of the velocity dispersion trends with [Mg/Fe] for thick-disc stars with [Fe/H] < -0.10 dex and [Mg/Fe] > +0.20 dex for the radial component. First, the velocity dispersion increases with [Mg/Fe] at all [Fe/H] ratios for the thin-disc stars, and then it decreases for the thick-disc population at the highest [Mg/Fe] abundances Similar trends are observed for several bins of [Mg/Fe] within the errors for the azimuthal velocity dispersion, while a continuous increase with [Mg/Fe] is observed for the vertical velocity dispersion. The velocity dispersion decrease agrees with previous measurements of the RAVE survey, although it is observed here for a greater metallicity interval and a larger spatial volume. Conclusions. Thanks to the Gaia-ESO Survey data, we confirm the existence of [Mg/Fe]-rich thick-disc stars with cool kinematics in the generally turbulent context of the primitive Galactic disc. This is discussed in the framework of the different disc formation and evolution scenarios.

Ämnesord

NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

Galaxy: abundances
Galaxy: disk
Galaxy: kinematics and dynamics
Galaxy: stellar content
stars: abundances
Galaxy: abundances
Galaxy: disk
Galaxy: kinematics and dynamics
Galaxy: stellar content
stars: abundances

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NATURVETENSKAP: NATURVETENSKAP; och Fysik; och Astronomi astrof ...

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