Milky Way chemo-dynamics in the era of Gaia

Abstract

The main goal of Galactic Archaeology is understanding the formation and evolution of the basic Galactic components. This requires sophisticated chemo-dynamical modeling, where disc asymmetries (e.g., perturbations from the central bar, spirals arms, and infalling satellites) and non-equilibrium processes are taken into account self-consistently. Here we discuss the current status of Galactic chemo-dynamical modeling and focus on a recent hybrid technique, which helps circumvent traditional problems with chemical enrichment and star formation encountered in fully self-consistent cosmological simulations. We show that this model can account for a number of chemo-kinematic relations in the Milky Way. In addition, we demonstrate that (1) our model matches well the observed age-[alpha/Fe] and age-[Fe/H] relations and (2) that the scatter in the age-[Fe/H] relation cannot be simply explained by blurring (stars on apo- and pericenters visiting the solar vicinity) but significant radial migration (stars born elsewhere but ending up at the solar vicinity today because of a change in guiding radius) is needed. We emphasize the importance of accurate stellar ages, such as those obtained through asteroseismology by the CoRoT and Kepler missions, for breaking the degeneracy among different Galactic evolution scenarios.

Interesting new Fig.2. To appear in Astronomische Nachrichten, special issue "Reconstruction the Milky Way's History: Spectroscopic surveys, Asteroseismology and Chemo-dynamical models", Guest Editors C. Chiappini, J. Montalbán, and M. Steffen, AN 2016 (in press)"

References in corpus (8)

• The Radial Velocity Experiment (RAVE): first data release
• Chemical enrichment in cosmological, smoothed particle hydrodynamics simulations
• The stellar population structure of the Galactic disk
• A First Constraint on the Thick Disk Scale Length: Differential Radial Abundances in K Giants at Galactocentric Radii 4, 8, and 12 kpc
• Young [$\alpha$/Fe]-enhanced stars discovered by CoRoT and APOGEE: What is their origin?
• On the Formation of Galactic Thick Disks
• Kinematic modelling of the Milky Way using the RAVE and GCS stellar surveys
• New Constraints on the Galactic Bar

Cited by in corpus (8)

• The relationship between mono-abundance and mono-age stellar populations in the Milky Way disk
• Metals and dust content across the galaxies M101 and NGC 628
• Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample VII: the Stellar Disk Structure Revealed by the Mono-abundance Populations
• The Pristine survey XIII: Uncovering the very metal-poor tail of the thin disc
• The evolution of the Milky Way's thin disc radial metallicity gradient with K2 asteroseismic ages
• The Flare and Warp of the Young Stellar Disk traced with LAMOST DR5 OB-type stars
• Age-metallicity dependent stellar kinematics of the Milky Way disc from LAMOST and Gaia
• Constraints on the history of Galactic spiral arms revealed by Gaia GSP-Spec alpha-elements