Impact of radial migration on stellar and gas radial metallicity distribution

Abstract

Radial migration is defined as the change in guiding centre radius of stars and gas caused by gains or losses of angular momentum that result from gravitational interaction with non-axisymmetric structure. This has been shown to have significant impact on the metallicity distribution in galactic discs, and therefore affects the interpretation of Galactic archeology. We use a simulation of a Milky Way-sized galaxy to examine the effect of radial migration on the star and gas radial metallicity distribution. We find that both the star and gas component show significant radial migration. The stellar radial metallicity gradient remains almost unchanged but the radial metallicity distribution of the stars is broadened to produce a greater dispersion at all radii. However, the metallicity dispersion of the gas remains narrow. We find that the main drivers of the gas metallicity distribution evolution are metal enrichment and mixing: more efficient metal enrichment in the inner region maintains a negative slope in the radial metallicity distribution, and the metal mixing ensures the tight relationship of the gas metallicity with the radius. The metallicity distribution function reproduces the trend in the age-metallicity relation found from observations for stars younger than 1.0 Gyr in the Milky Way.

11 pages, 12 figures. Matches version accepted by MNRAS. Comments welcome

References in corpus (12)

• The Radial Velocity Experiment (RAVE): first data release
• New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
• Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks
• Modelling discontinuities and Kelvin-Helmholtz instabilities in SPH
• Molecular Hydrogen and Global Star Formation Relations in Galaxies
• Dawes Review 4: Spiral Structures in Disc Galaxies
• Radial mixing and the transition between the thick and thin Galactic discs
• Stellar Population gradients in galaxy discs from the CALIFA survey
• APOGEE: The Apache Point Observatory Galactic Evolution Experiment
• The effect of radial migration on galactic disks
• Chemical mixing in smoothed particle hydrodynamics simulations
• Gas and Stellar Motions and Observational Signatures of Co-Rotating Spiral Arms

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• SDSS-IV MaNGA: drivers of stellar metallicity in nearby galaxies
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• An observational testbed for cosmological zoom-in simulations: constraining stellar migration in the solar cylinder using asteroseismology
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• The Milky Way in context: The formation of galactic discs and chemical sequences from a cosmological perspective
• Improved SED-Fitting Assumptions Result in Inside-Out Quenching at $z\sim 0.5$ and Quenching at All Radii Simultaneously at $z\sim 1$
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• Tidally-induced radial migration waves in LMC-like galaxies
• Emergence of red, star-forming galaxies (red misfits) in a ΛCDM universe
• The Metallicity Distribution Function in Outer Halo Fields of Simulated Elliptical Galaxies Compared to Observations of NGC 5128
• Evidence for temporal evolution in the M33 disc as traced by its star clusters