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Verfasst von:Gent, Matthew [VerfasserIn]   i
 Eitner, Philipp [VerfasserIn]   i
 Serenelli, Aldo [VerfasserIn]   i
 Friske, Jennifer K. S. [VerfasserIn]   i
 Koposov, Sergey E. [VerfasserIn]   i
 Laporte, Chervin F. P. [VerfasserIn]   i
 Buck, Tobias [VerfasserIn]   i
 Bergemann, Maria [VerfasserIn]   i
Titel:The prince and the pauper
Titelzusatz:evidence for the early high-redshift formation of the Galactic α-poor disc population
Verf.angabe:Matthew Raymond Gent, Philipp Eitner, Aldo Serenelli, Jennifer K.S. Friske, Sergey E. Koposov, Chervin F.P. Laporte, Tobias Buck, Maria Bergemann
E-Jahr:2024
Jahr:08 March 2024
Umfang:13 S.
Illustrationen:Illustrationen
Fussnoten:Gesehen am 08.10.2024
Titel Quelle:Enthalten in: Astronomy and astrophysics
Ort Quelle:Les Ulis : EDP Sciences, 1969
Jahr Quelle:2024
Band/Heft Quelle:683(2024) vom: März, Artikel-ID A74, Seite 1-13
ISSN Quelle:1432-0746
Abstract:Context. The presence of [α/Fe]-[Fe/H] bi-modality in the Milky Way disc has intrigued the Galactic archaeology community over more than two decades. Aims. Our goal is to investigate the chemical, temporal, and kinematical structure of the Galactic discs using abundances, kinematics, and ages derived self-consistently with the new Bayesian framework SAPP. Methods. We employed the public Gaia-ESO spectra, as well as Gaia EDR3 astrometry and photometry. Stellar parameters and chemical abundances are determined for 13 426 stars using NLTE models of synthetic spectra. Ages were derived for a sub-sample of 2898 stars, including subgiants and main-sequence stars. The sample probes a large range of Galactocentric radii, ∼3 to 12 kpc, and extends out of the disc plane to ±2 kpc. Results. Our new data confirm the known bi-modality in the [Fe/H]-[α/Fe] space, which is often viewed as the manifestation of the chemical thin and thick discs. The over-densities significantly overlap in metallicity, age, and kinematics and none of them offer a sufficient criterion for distinguishing between the two disc populations. In contrast to previous studies, we find that the α-poor disc population has a very extended [Fe/H] distribution and contains ∼20% old stars with ages of up to ∼11 Gyr. Conclusions. Our results suggest that the Galactic thin disc was in place early, at lookback times corresponding to redshifts of z ∼ 2 or more. At ages of ∼9 to 11 Gyr, the two disc structures shared a period of co-evolution. Our data can be understood within the clumpy disc formation scenario that does not require a pre-existing thick disc to initiate the formation of the thin disc. We anticipate that a similar evolution can be realised in cosmological simulations of galaxy formation.
DOI:doi:10.1051/0004-6361/202244157
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1051/0004-6361/202244157
 Volltext: https://www.aanda.org/articles/aa/abs/2024/03/aa44157-22/aa44157-22.html
 DOI: https://doi.org/10.1051/0004-6361/202244157
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1905069367
Verknüpfungen:→ Zeitschrift

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