Radial migration and vertical action in N-body simulations
arXiv:2004.13646 · doi:10.1093/mnras/staa1223
Abstract
We study the radial migration of stars as a function of orbital action as well as the structural properties of a large suite of N-body simulations of isolated disc galaxies. Our goal is to establish a relationship between the radial migration efficiency of stars and their vertical action. We aim to describe how that relationship depends on the relative gravitational dominance between the disc and the dark matter halo. By changing the mass ratio of our disc and dark matter halo we find a relationship between disc dominance, number and strength of spiral arms, and the ensuing radial migration as a function of the vertical action. We conclude that the importance of migration at large vertical action depends on the strength of the spiral arms and therefore the dominance of the disc. Populations with more radial action undergo less radial migration, independently of disc dominance. Our results are important for the future of analytical modelling of radial migration in galaxies and furthers the understanding of radial migration which is a key component of the restructuring of galaxies, including the Milky Way.
arXiv comment13 pages, 12 figures, accepted for publication in MNRAS
References in corpus (30)
- Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the Solar neighbourhood
- The mass distribution and gravitational potential of the Milky Way
- Radial Mixing in Galactic Discs
- Chemical evolution with radial mixing
- Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks
- A Hierarchical O(N) Force Calculation Algorithm
- Actions for axisymmetric potentials
- A Very Fast and Momentum-Conserving Tree Code
- The Gaia-ESO Survey: radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk
- Estimating stellar birth radii and the time evolution of the Milky Way's ISM metallicity gradient
- On the Formation of Galactic Thick Disks
- Radial Migration Does Little for Galactic Disc Thickening
- Radial Migration in Disk Galaxies I: Transient Spiral Structure and Dynamics
- Dynamical insight into dark-matter haloes
- Measuring Radial Orbit Migration in the Milky Way Disk
- The Galactic Disc in Action Space as seen by Gaia DR2
- Age velocity dispersion relations and heating histories in disc galaxies
- The effect of radial migration on galactic disks
- Radial Migration in Galactic Thick Discs
- Initial conditions for disc galaxies
- Understanding inverse metallicity gradients in galactic discs as a consequence of inside-out formation
- Quantifying stellar radial migration in an N-body simulation: blurring, churning, and the outer regions of galaxy discs
- Simple Distribution Functions for Stellar Disks
- The quiescent phase of galactic disc growth
- Disk-stability constraints on the number of arms in spiral galaxies
- Constraints on Radial Migration in Spiral Galaxies - II. Angular momentum distribution and preferential migration
- The structural evolution of galaxies with both thin and thick discs
- The imprint of radial migration on the vertical structure of galaxy disks
- Migration and kinematics in growing disc galaxies with thin and thick discs
- Bimodal Distribution of Galactic Disk Stars on the [alpha/Fe]-[Fe/H] Plane as a Possible Evidence of Discontinuous Radial Migration History
Cited by in corpus (14)
- VINTERGATAN I: The origins of chemically, kinematically and structurally distinct discs in a simulated Milky Way-mass galaxy
- The GALAH survey: tracing the Galactic disk with Open Clusters
- Spirals in galaxies
- Co-formation of the thin and thick discs revealed by APOGEE-DR16 and Gaia-DR2
- From giant clumps to clouds -- II. The emergence of thick disc kinematics from the conditions of star formation in high redshift gas rich galaxies
- The Flattening Metallicity Gradient in the Milky Way's Thin Disk
- Stellar migration in the Auriga simulations
- Efficient radial migration by giant molecular clouds in the first several hundred Myr after the stellar birth
- How stars formed in warps settle into (and contaminate) thick discs
- Fundamental limits to orbit reconstruction due to non-conservation of stellar actions in a Milky Way-like simulation
- Tidally-induced radial migration waves in LMC-like galaxies
- Resonant Effects of a Bar on the Galactic Disk Kinematics Perpendicular to Its Plane
- Evolution of action-space coherence in a Milky Way-like simulation
- Bar Properties and Star-by-Star Bar Membership via Action Conservation