(WFRF:(Bensby T.)) pers:(Guiglion G.)
Sökning: (WFRF:(Bensby T.)) pers:(Guiglion G.) > The Gaia-ESO Survey :
The Gaia-ESO Survey : Churning through the Milky Way
-
- Hayden, M. R. (författare)
- Univ Nice Sophia Antipolis, Lab Lagrange UMR 7293, CNRS, Observ Cote Azur, BP 4229, F-06304 Nice 4, France.,Université Nice Sophia Antipolis,Côte d'Azur Observatory
-
- Recio-Blanco, A. (författare)
- Univ Nice Sophia Antipolis, Lab Lagrange UMR 7293, CNRS, Observ Cote Azur, BP 4229, F-06304 Nice 4, France.,Université Nice Sophia Antipolis,Côte d'Azur Observatory
-
- de Laverny, P. (författare)
- Univ Nice Sophia Antipolis, Lab Lagrange UMR 7293, CNRS, Observ Cote Azur, BP 4229, F-06304 Nice 4, France.,Université Nice Sophia Antipolis,Côte d'Azur Observatory
- visa fler...
- visa färre...
- Univ Nice Sophia Antipolis, Lab Lagrange UMR 7293, CNRS, Observ Cote Azur, BP 4229, F-06304 Nice 4, France Université Nice Sophia Antipolis (creator_code:org_t)
- 2018-01-12
- 2018
- Engelska.
- Ingår i: Astronomy and Astrophysics. - : EDP SCIENCES S A. - 0004-6361 .- 1432-0746. ; 609
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Context: There have been conflicting results with respect to the extent that radial migration has played in the evolution of the Galaxy. Additionally, observations of the solar neighborhood have shown evidence of a merger in the past history of the Milky Way that drives enhanced radial migration.Aims: We attempt to determine the relative fraction of stars that have undergone significant radial migration by studying the orbital properties of metal-rich ([Fe/H] > 0.1) stars within 2 kpc of the Sun. We also aim to investigate the kinematic properties, such as velocity dispersion and orbital parameters, of stellar populations near the Sun as a function of [Mg/Fe] and [Fe/H], which could show evidence of a major merger in the past history of the Milky Way.Methods: We used a sample of more than 3000 stars selected from the fourth internal data release of the Gaia-ESO Survey. We used the stellar parameters from the Gaia-ESO Survey along with proper motions from PPMXL to determine distances, kinematics, and orbital properties for these stars to analyze the chemodynamic properties of stellar populations near the Sun.Results: Analyzing the kinematics of the most metal-rich stars ([Fe/H] > 0 : 1), we find that more than half have small eccentricities (e < 0 : 2) or are on nearly circular orbits. Slightly more than 20% of the metal-rich stars have perigalacticons R-p > 7 kpc. We find that the highest [Mg/ Fe], metal-poor populations have lower vertical and radial velocity dispersions compared to lower [Mg/Fe] populations of similar metallicity by similar to 10 km s(-1). The median eccentricity increases linearly with [Mg/Fe] across all metallicities, while the perigalacticon decreases with increasing [Mg/Fe] for all metallicities. Finally, the most [Mg/Fe]-rich stars are found to have significant asymmetric drift and rotate more than 40 km s(-1) slower than stars with lower [Mg/Fe] ratios.Conclusions: While our results cannot constrain how far stars have migrated, we propose that migration processes are likely to have played an important role in the evolution of the Milky Way, with metal-rich stars migrating from the inner disk toward to solar neighborhood and past mergers potentially driving enhanced migration of older stellar populations in the disk.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Galaxy: kinematics and dynamics
- Galaxy: disk
- Galaxy: stellar content
- Galaxy: structure
- Galaxy: disk
- Galaxy: kinematics and dynamics
- Galaxy: stellar content
- Galaxy: structure
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
- Astronomy and Astrophysics (Sök värdpublikationen i LIBRIS)
Till lärosätets databas
Hitta mer i SwePub
- Av författaren/redakt...
- Hayden, M. R.
- Recio-Blanco, A.
- de Laverny, P.
- Mikolaitis, S.
- Guiglion, G.
- Hill, V.
- visa fler...
- Gilmore, G.
- Randich, S.
- Bayo, A.
- Bensby, T.
- Bergemann, M.
- Bragaglia, A.
- Casey, A.
- Costado, M.
- Feltzing, S.
- Franciosini, E.
- Hourihane, A.
- Jofre, P.
- Koposov, S.
- Kordopatis, G.
- Lanzafame, A.
- Lardo, C.
- Lewis, J.
- Lind, Karin
- Magrini, L.
- Monaco, L.
- Morbidelli, L.
- Pancino, E.
- Sacco, G.
- Stonkute, E.
- Worley, C. C.
- Zwitter, T.
- visa färre...
- Om ämnet
-
- NATURVETENSKAP
- NATURVETENSKAP
- och Fysik
- och Astronomi astrof ...
- Artiklar i publikationen
- Astronomy and As ...
- Av lärosätet
- Uppsala universitet
- Lunds universitet
Sök utanför SwePub
- Sök vidare i:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - Nationella bibliotekssystem
- LIBRIS.kb.se
