Towards a fully consistent Milky Way disk model

• Verfasst von: Sysoliatina, Kseniia [VerfasserIn]
• Verfasst von: 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
• DOI: doi: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

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.