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The Gaia-ESO Survey: New constraints on the Galactic disc velocity dispersion and its chemical dependencies
- Source :
- Guiglion, G, Recio-Blanco, A, Laverny, P D, Kordopatis, G, Hill, V, Mikolaitis, Š, Minchev, I, Chiappini, C, Wyse, R F G, Gilmore, G, Randich, S, Feltzing, S, Bensby, T, Flaccomio, E, Koposov, S E, Pancino, E, Bayo, A, Costado, M T, Franciosini, E, Hourihane, A, Jofré, P, Lardo, C, Lewis, J, Lind, K, Magrini, L, Morbidelli, L, Sacco, G G, Ruchti, G, Worley, C C & Zaggia, S 2015, ' The Gaia-ESO Survey : New constraints on the Galactic disc velocity dispersion and its chemical dependencies ', Astronomy and Astrophysics . https://doi.org/10.1051/0004-6361/201525883, NASA Astrophysics Data System
- Publication Year :
- 2015
-
Abstract
- Understanding the history and the evolution of the Milky Way disc is one of the main goals of modern astrophysics. We study the velocity dispersion behaviour of Galactic disc stars as a function of the [Mg/Fe] ratio, which 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 processes. 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 Survey. These stars were observed with the GIRAFFE spectrograph, and cover a large spatial volume (6+0.2dex. 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 at the highest [Mg/Fe] abundances. Similar trends are observed 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. 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 scenarios.<br />Comment: 14 pages, 13 figures, A&A accepted
- Subjects :
- 010504 meteorology & atmospheric sciences
Metallicity
Milky Way
astro-ph.GA
FOS: Physical sciences
Kinematics
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Galaxy: disk
Astronomi, astrofysik och kosmologi
0103 physical sciences
stellar content [Galaxy]
Astronomy, Astrophysics and Cosmology
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Spectrograph
QC
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
QB
Physics
Galaxy: stellar content
Turbulence
Stars: abundances
Velocity dispersion
abundances [Galaxy]
Astronomy and Astrophysics
kinematics and dynamics [Galaxy]
Astrophysics - Astrophysics of Galaxies
abundances [stars]
Galaxy: abundance
Stars
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
Galaxy: kinematics and dynamic
Astrophysics::Earth and Planetary Astrophysics
Data release
disk [Galaxy]
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Database :
- OpenAIRE
- Journal :
- Guiglion, G, Recio-Blanco, A, Laverny, P D, Kordopatis, G, Hill, V, Mikolaitis, Š, Minchev, I, Chiappini, C, Wyse, R F G, Gilmore, G, Randich, S, Feltzing, S, Bensby, T, Flaccomio, E, Koposov, S E, Pancino, E, Bayo, A, Costado, M T, Franciosini, E, Hourihane, A, Jofré, P, Lardo, C, Lewis, J, Lind, K, Magrini, L, Morbidelli, L, Sacco, G G, Ruchti, G, Worley, C C & Zaggia, S 2015, ' The Gaia-ESO Survey : New constraints on the Galactic disc velocity dispersion and its chemical dependencies ', Astronomy and Astrophysics . https://doi.org/10.1051/0004-6361/201525883, NASA Astrophysics Data System
- Accession number :
- edsair.doi.dedup.....2c8d1e444ec47ba148fba7ad5275a563