Towards a fully consistent Milky Way disk model V. The disk model for 4 $-$ 14 kpc

Abstract

We present a generalised version of the semi-analytic Just-Jahreiss (JJ) model of the Galactic disk that incorporates our findings for the solar neighbourhood and is applicable to a wide range of galactocentric distances, 4 kpc $\lesssim R\lesssim$ 14 kpc. The JJ model is a flexible tool for stellar population synthesis with a fine age resolution of 25 Myr. It includes six Milky-Way (MW) components: the four flattened (exponential thin and thick disk, atomic and molecular gas) and two spheroidal (spherical stellar halo and a cored isothermal dark matter sphere). The overall thin-disk thickness is assumed to be constant at all radii, though flaring can also be tested. The adopted radial variation in the thin-disk star-formation rate (SFR) reflects the inside-out disk growth scenario. We allow a smooth power-law SFR continuum to be modified by an arbitrary number of Gaussian peaks. We present a public code of the JJ model complemented by the three sets of isochrones (PARSEC, MIST, and BaSTI). Using metallicity distributions of the red clump giants from APOGEE, we constrain the radial variation of the JJ-model age-metallicity relation (AMR) and propose a new analytic form for the AMR function. The generalised JJ model is a publicly available tool for studying different stellar populations across the MW disk. With its fine age resolution and flexibility, it can be particularly useful for reconstructing the thin-disk SFR, as a variety of different SFR shapes can be constructed within its framework.

21 pages, 12 figures, 3 tables. Accepted for publication by A&A

References in corpus (25)

• The NumPy array: a structure for efficient numerical computation
• The Gaia mission
• Modules for Experiments in Stellar Astrophysics (MESA)
• The Radial Velocity Experiment (RAVE): first data release
• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• The Radial Velocity Experiment (RAVE): Fifth Data Release
• The Local Dark Matter Density
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE) Spectrographs
• Target Selection for the SDSS-IV APOGEE-2 Survey
• The APOGEE red-clump catalog: Precise distances, velocities, and high-resolution elemental abundances over a large area of the Milky Way's disk
• A time-resolved picture of our Milky Way's early formation history
• On the Formation of Galactic Thick Disks
• The age-metallicity structure of the Milky Way disk
• Constraining the thick disc formation scenario of the Milky Way
• An intuitive 3D map of the Galactic warp's precession traced by classical Cepheids
• Gaia DR2 reveals a star formation burst in the disc 2-3 Gyr ago
• The Impact of Feedback During Massive Star Formation by Core Accretion
• Kinematics of the local disk from the RAVE survey and the Gaia first data release
• The relationship between mono-abundance and mono-age stellar populations in the Milky Way disk
• Characterizing epochs of star formation across the Milky Way disc using age-metallicity distributions of GALAH stars
• Towards a fully consistent Milky Way disc model - III. Constraining the initial mass function
• Does the stellar distribution flare? A comparison of stellar scale heights with LAB HI data
• Dissecting the Gaia HR diagram within 200 pc
• Towards a fully consistent Milky Way disc model - II. The local disc model and SDSS data of the NGP region
• Towards a fully consistent Milky Way disk model -- IV. The impact of Gaia DR2 and APOGEE