Chemical Evolution with Radial Mixing Redux: Extending beyond the Solar Neighborhood

Abstract

We present a multi-zone galactic chemical evolution (GCE) model for the Milky Way that takes the most recently updated yields of major nucleosynthesis channels into account. It incorporates physical processes commonly found in previous GCE models like supernova and star formation feedback, the radial flow of gas in the disk, and the infall of fresh gas, along with stellar scattering processes like radial migration. We individually analyse the effect of different physical processes present in our model on the observed properties of the Galaxy. The radial flow of gas in the disk plays an important role in establishing the radial gradient for \feh{} in the low-\alphafe{} sequence. Our model with one episode of smooth gas infall and constant star formation efficiency is capable of reproducing the observed \fehalpha{} distribution of stars at different ($R$, $|z|$) positions in the Milky Way. Our results point to the rapid evolution of \alphafe{} after the onset of Type Ia supernovae and a high star formation rate during the formation of the high-\alphafe{} sequence as the origin of dual peaks in \alphafe{}. A secondary infall is unnecessary to reproduce the \alphafe{}-gap and chemical spread in the disk in our model. We additionally compare the median age for various mono-abundance populations and the age-metallicity relation at different ($R$, $|z|$) positions from our fiducial model to observations. We discuss our results in relation to other related work in detail.

27 pages, 15 figures, submitted to MNRAS

References in corpus (16)

• galpy: A Python Library for Galactic Dynamics
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• A time-resolved picture of our Milky Way's early formation history
• Reconstructing the star formation history of the Milky Way disc(s) from chemical abundances
• Origin of chemically distinct discs in the Auriga cosmological simulations
• First results from SMAUG: Characterization of Multiphase Galactic Outflows from a Suite of Local Star-Forming Galactic Disk Simulations
• Molecular Cloud Populations in the Context of Their Host Galaxy Environments: A Multiwavelength Perspective
• The imprint of clump formation at high redshift. I. A disc alpha-abundance dichotomy
• APOGEE DR16: a multi-zone chemical evolution model for the Galactic disc based on MCMC methods
• Extended distribution functions for our Galaxy
• Revisiting long-standing puzzles of the Milky Way: the Sun and its vicinity as typical outer disk chemical evolution
• The age-chemical abundance structure of the Galactic disc II: $\alpha$-dichotomy and thick disc formation
• The Close Binary Fraction as a Function of Stellar Parameters in APOGEE: A Strong Anti-Correlation With $\alpha$ Abundances
• The DUVET Survey: Direct $T_e$-based metallicity mapping of metal-enriched outflows and metal-poor inflows in Mrk 1486
• There is No Place Like Home -- Finding Birth Radii of Stars in the Milky Way
• Turning Points in the Age-Metallicity Relations -- Created by Late Satellite Infall and Enhanced by Radial Migration

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• A Tale of Two Disks: Mapping the Milky Way with the Final Data Release of APOGEE
• (Re)mind the gap: a hiatus in star formation history unveiled by APOGEE DR17
• The interplay between feedback, accretion, transport and winds in setting gas-phase metal distribution in galaxies
• Observational Constraints of Radial Migration in the Galactic Disc Driven by the Slowing Bar
• Galactic Chemical Evolution Models Favor an Extended Type Ia Supernova Delay-Time Distribution
• Exploring the impact of a rapidly decelerating bar on transforming bulge orbits into disc-like orbits
• Mapping the Milky Way with Gaia Bp/Rp spectra I: Systematic flux corrections and atmospheric parameters for 68 million stars
• Rediscovering the Milky Way with orbit superposition approach and APOGEE data II. Chrono-chemo-kinematics of the disc
• The Milky Way in context: The formation of galactic discs and chemical sequences from a cosmological perspective
• A path towards constraining the evolution of the interstellar medium and outflows in the Milky Way using APOGEE