Quantifying radial migration in the Milky Way: Inefficient over short timescales but essential to the very outer disc beyond ~15 kpc

Abstract

Stellar radial migration plays an important role in reshaping a galaxy's structure and the radial distribution of stellar population properties. In this work, we revisit reported observational evidence for radial migration and quantify its strength using the age--[Fe/H] distribution of stars across the Milky Way with APOGEE data. We find a broken age--[Fe/H] relation in the Galactic disc at $r>6$ kpc, with a more pronounced break at larger radii. To quantify the strength of radial migration, we assume stars born at each radius have a unique age and metallicity, and then decompose the metallicity distribution function (MDF) of mono-age young populations into different Gaussian components that originated from various birth radii at $r_{\mathrm{birth}}<13$ kpc. We find that, at ages of 2 and 3 Gyr, roughly half the stars were formed within 1 kpc of their present radius, and very few stars ($<5$%) were formed more than 4 kpc away from their present radius. These results suggest limited short distance radial migration and inefficient long distance migration in the Milky Way during the last 3 Gyr. In the very outer disc beyond 15~kpc, the observed age--[Fe/H] distribution is consistent with the prediction of pure radial migration from smaller radii, suggesting a migration origin of the very outer disc. We also estimate intrinsic metallicity gradients at ages of 2 and 3 Gyr of $-0.061$ dex kpc${}^{-1}$ and $-0.063$ dex kpc${}^{-1}$, respectively.

arXiv comment18 pages, 12 figures, MNRAS in press

References in corpus (110)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
• galpy: A Python Library for Galactic Dynamics
• The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
• Radial Mixing in Galactic Discs
• The Chemical Evolution of the Galaxy: the two-infall model
• ASPCAP: The Apogee Stellar Parameter and Chemical Abundances Pipeline
• Chemical evolution with radial mixing
• Chemical Cartography with APOGEE: Metallicity Distribution Functions and the Chemical Structure of the Milky Way Disk
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. V. Evidence for a wide age distribution and a complex MDF
• Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks
• APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
• Chemodynamical evolution of the Milky Way disk I: The solar vicinity
• Age and Metallicity Distribution of the Galactic Bulge from Extensive Optical and Near-IR Stellar Photometry
• The Data Reduction Pipeline for the Apache Point Observatory Galactic Evolution Experiment
• Target Selection for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• A New Mechanism for Radial Migration in Galactic Disks: Spiral-Bar Resonance Overlap
• Beyond Inside-Out Growth: Formation and Evolution of Disk Outskirts
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE) Spectrographs
• The Second APOKASC Catalog: The Empirical Approach
• Target Selection for the SDSS-IV APOGEE-2 Survey
• Breathing FIRE: How Stellar Feedback Drives Radial Migration, Rapid Size Fluctuations, and Population Gradients in Low-Mass Galaxies
• The Genesis of the Milky Way's Thick Disk via Stellar Migration
• Chemodynamical evolution of the Milky Way disk II: Variations with Galactic radius and height above the disk plane
• The metallicity distribution of bulge clump giants in Baade's Window
• Radial mixing and the transition between the thick and thin Galactic discs
• The APOGEE red-clump catalog: Precise distances, velocities, and high-resolution elemental abundances over a large area of the Milky Way's disk
• The Distribution of the Elements in the Galactic Disk III. A Reconsideration of Cepheids from l = 30 to 250 Degrees
• Dynamical heating across the Milky Way disc using APOGEE and $Gaia$
• Galactic Metallicity Gradients Derived from a Sample of OB Stars
• Deep learning of multi-element abundances from high-resolution spectroscopic data
• Radial migration in galactic disks caused by resonance overlap of multiple patterns: Self-consistent simulations
• The Gaia-ESO Survey: radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk
• HII Region Metallicity Distribution in the Milky Way Disk
• On the fine structure of the Cepheid metallicity gradient in the Galactic thin disk
• Estimating stellar birth radii and the time evolution of the Milky Way's ISM metallicity gradient
• Galactic Archaeology with asteroseismic ages: evidence for delayed gas infall in the formation of the Milky Way disc
• Color Profiles of Spiral Galaxies: Clues on Outer-Disk Formation Scenarios
• The age-metallicity structure of the Milky Way disk
• A new alpha-enhanced super-solar metallicity population
• Evolution of the Milky Way with radial motions of stars and gas I. The solar neighborhood and the thin and thick disk
• On the origin of the chemical bimodality of disk stars: A tale of merger and migration
• From the bulge to the outer disc: StarHorse stellar parameters, distances, and extinctions for stars in APOGEE DR16 and other spectroscopic surveys
• Insights on the Milky Way bulge formation from the correlations between kinematics and metallicity
• Confirming chemical clocks: asteroseismic age dissection of the Milky Way disk(s)
• Measuring Radial Orbit Migration in the Milky Way Disk
• Signatures of radial migration in barred galaxies: Azimuthal variations in the metallicity distribution of old stars
• Radial mixing in the outer Milky Way disk caused by an orbiting satellite
• The APOGEE Data Release 16 Spectral Line List
• Red giants observed by CoRoT and APOGEE: The evolution of the Milky Way's radial metallicity gradient
• Origin of chemically distinct discs in the Auriga cosmological simulations
• The Gaia-ESO Survey: Exploring the complex nature and origins of the Galactic bulge populations
• High-precision abundances of elements in solar-type stars. Evidence of two distinct sequences in abundance-age relations
• Chemical Enrichment and Radial Migration in the Galactic Disk -- the origin of the [$\alpha /\mathrm{Fe}]$ Double Sequence
• The SAMI Galaxy Survey: Spatially resolving the environmental quenching of star formation in GAMA galaxies
• Keeping it Cool: Much Orbit Migration, yet Little Heating, in the Galactic Disk
• Final Targeting Strategy for the SDSS-IV APOGEE-2S Survey
• Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey
• Stellar diffusion in barred spiral galaxies
• The age of the Sun and the relativistic corrections in the EOS
• Imprints of radial migration on the Milky Way's metallicity distribution functions
• Chemical evolution of local galaxies in a hierarchical model
• The Chemical Evolution Carousel of Spiral Galaxies: Azimuthal Variations of Oxygen Abundance in NGC1365
• Spatial variations in the Milky Way disc metallicity-age relation
• Age-resolved chemistry of red giants in the solar neighbourhood
• Chemical abundance patterns in the inner Galaxy: the Scutum Red Supergiant Clusters
• Quantifying stellar radial migration in an N-body simulation: blurring, churning, and the outer regions of galaxy discs
• How Many Components? Quantifying the Complexity of the Metallicity Distribution in the Milky Way Bulge with APOGEE
• Impact of radial migration on stellar and gas radial metallicity distribution
• Galactic Archaeology with asteroseismic ages. II. Confirmation of a delayed gas infall using Bayesian analysis based on MCMC methods
• Stellar migrations and metal flows -- Chemical evolution of the thin disc of a simulated Milky Way analogous galaxy
• Constraining Metallicity-dependent Mixing and Extra Mixing using [C/N] in Alpha-Rich Field Giants
• Star formation history of the Galactic bulge from deep HST imaging of low reddening windows
• Testing For Azimuthal Abundance Gradients In M101
• Ages and masses of million Galactic disk main sequence turn-off and sub-giant stars from the LAMOST Galactic spectroscopic surveys
• SDSS-IV MaNGA: Inside-out vs. outside-in quenching in different local environments
• Measuring the mixing scale of the ISM within nearby spiral galaxies
• Metallicity Structure in the Milky Way Disk Revealed by Galactic HII Regions
• Bimodality of [α/Fe]-[Fe/H] distributions is a natural outcome of dissipative collapse and disc growth in Milky Way-type galaxies
• Revisiting long-standing puzzles of the Milky Way: the Sun and its vicinity as typical outer disk chemical evolution
• Chemical evolution of the Galactic bulge: different stellar populations and possible gradients
• The age-chemical abundance structure of the Galactic disc II: $\alpha$-dichotomy and thick disc formation
• Spatially Resolved Spectroscopic Star Formation Histories of Nearby Disks: Hints of Stellar Migration
• Co-formation of the thin and thick discs revealed by APOGEE-DR16 and Gaia-DR2
• VINTERGATAN III: how to reset the metallicity of the Milky Way
• Galactic planetary nebulae as probes of radial metallicity gradients and other abundance patterns
• Accelerated post-AGB evolution, initial-final mass relations, and the star-formation history of the Galactic bulge
• Ages and Masses of 0.64 million Red Giant Branch stars from the LAMOST Galactic Spectroscopic Survey
• Characterizing epochs of star formation across the Milky Way disc using age-metallicity distributions of GALAH stars
• The Similarity of Abundance Ratio Trends and Nucleosynthetic Patterns in the Milky Way Disk and Bulge
• Escapees from the bar resonances. On the presence of low-eccentricity, metal-rich stars at the Solar vicinity
• Mass and Age of Red Giant Branch Stars Observed with LAMOST and \emph{Kepler}
• The bimodal [Mg/Fe] versus [Fe/H] bulge sequence as revealed by APOGEE DR14
• Exploring the stellar age distribution of the Milky Way Bulge using APOGEE
• Age-chemical abundance structure of the Galaxy I: Evidence for a late accretion event in the outer disc at z ~ 0.6
• Constraints on Radial Migration in Spiral Galaxies I. Analytic Criterion for Capture at Corotation
• Census of HII regions in NGC 6754 derived with MUSE: Constraints on the metal mixing scale
• Radial abundance gradients in the outer Galactic disk as traced by main-sequence OB stars
• Radial Migration from Metallicity Gradient of Open Clusters and Outliers
• The Milky Way's bulge star formation history as constrained from its bimodal chemical abundance distribution
• APOGEE [C/N] Abundances Across the Galaxy: Migration and Infall from Red Giant Ages
• Using classical Cepheids to study the far side of the Milky Way disk: I. Spectroscopic classification and the metallicity gradient
• The Controversial Star-Formation History and Helium Enrichment of the Milky Way Bulge
• Stellar ages and masses in the solar neighbourhood: Bayesian analysis using spectroscopy and Gaia DR1 parallaxes
• Observational hints for radial migration in disc galaxies from CALIFA
• The chemical properties of the Milky Way's on-bar and off-bar regions: evidence for inhomogeneous star formation history in the bulge
• When Cold Radial Migration is Hot: Constraints from Resonant Overlap
• What planetary nebulae tell us about helium and the CNO elements in Galactic bulge stars

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• A Tale of Two Disks: Mapping the Milky Way with the Final Data Release of APOGEE
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• Rediscovering the Milky Way with orbit superposition approach and APOGEE data II. Chrono-chemo-kinematics of the disc
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• Probing the origins. I. Generalised Additive Model inference of birth radii for Milky Way stars in the solar vicinity
• On the genesis of spiral galaxies -- Classical and pseudo bulges as extremities of a continuous sequence
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• Solid grains ejected from terrestrial exoplanets as a probe of the abundance of life in the Milky Way
• Open clusters in the outer disc studied with MEGARA@GTC Auner 1 and Berkeley 102
• Evolution and star formation history of NGC300 from a chemical evolution model with radial gas inflows
• Comparing radial migration in dark matter and MOND regimes
• Turning Points in the Age-Metallicity Relations -- Created by Late Satellite Infall and Enhanced by Radial Migration
• Superbubbles as the source of dynamical friction: gas migration, stellar and dark matter contributions
• A Quadruple Excess in Wide Binary Systems: Evidence for Correlated Binary Formation