Status: Bibliographieeintrag
| Online-Ressource |
Verfasst von: | Sysoliatina, Kseniia [VerfasserIn]  |
| Just, Andreas [VerfasserIn]  |
Titel: | Towards a fully consistent Milky Way disk model |
Titelzusatz: | IV. The impact of Gaia DR2 and APOGEE |
Verf.angabe: | K. Sysoliatina and A. Just |
E-Jahr: | 2021 |
Jahr: | 05 March 2021 |
Umfang: | 28 S. |
Fussnoten: | Gesehen am 04.05.2021 |
Titel Quelle: | Enthalten in: Astronomy and astrophysics |
Ort Quelle: | Les Ulis : EDP Sciences, 1969 |
Jahr Quelle: | 2021 |
Band/Heft Quelle: | 647(2021), Artikel-ID A39, Seite 1-28 |
ISSN Quelle: | 1432-0746 |
Abstract: | We present an updated version of the semi-analytic Just-Jahreiß (JJ) model of the Galactic disk and constrain its parameters in the Solar neighbourhood. The new features of the JJ model include a simple two-component gaseous disk, a star-formation rate (SFR) function of the thick disk that has been extended in time, and a correlation between the kinematics of molecular gas and thin-disk populations. Here, we study the vertical number density profiles and W-velocity distributions determined from ~2 million local stars of the Gaia DR2. We also investigate an apparent Hess diagram of the Gaia stars selected in a conic volume towards the Galactic poles. Using a stellar evolution library, we synthesise stellar populations with a four-slope broken power-law initial mass function (IMF), the SFR, and an age-metallicity relation (AMR). The latter is consistently derived with the observed metallicity distribution of the local Red Clump (RC) giants from the APOGEE. Working within a Bayesian approach, we sample the posterior probability distribution in a multidimensional parameter space using the MCMC method. We find that the spatial distribution and motion of the Gaia stars imply two recent SF bursts centered at ages of ~0.5 Gyr and ~3 Gyr and characterised by a ~30% and ~55% SF enhancement, respectively, relative to a monotonously declining SFR continuum. The stellar populations associated with this SF excess are found to be dynamically hot for their age: they have W-velocity dispersions of ~12.5 km/s and ~26 km/s. The new JJ model is able to reproduce the local star counts with an accuracy of ~5 %. Using Gaia DR2 data, we self-consistently constrained 22 parameters of the updated JJ model. Our optimised model predicts two SF bursts within the last ~4 Gyr, which may point to recent episodes of gas infall. |
DOI: | doi:10.1051/0004-6361/202038840 |
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 ; Verlag: https://doi.org/10.1051/0004-6361/202038840 |
| Volltext: https://www.aanda.org/articles/aa/abs/2021/03/aa38840-20/aa38840-20.html |
| DOI: https://doi.org/10.1051/0004-6361/202038840 |
Datenträger: | Online-Ressource |
Sprache: | eng |
Bibliogr. Hinweis: | Errata: Sysoliatina, Kseniia, 1992 - : Towards a fully consistent Milky Way disk model |
K10plus-PPN: | 1757063765 |
Verknüpfungen: | → Zeitschrift |
Towards a fully consistent Milky Way disk model / Sysoliatina, Kseniia [VerfasserIn]; 05 March 2021 (Online-Ressource)
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