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Photo of Paul McMillan

Paul McMillan

Researcher

Photo of Paul McMillan

Radial migration and vertical action in N-body simulations

Author

  • Daniel Mikkola
  • Paul J. McMillan
  • David Hobbs

Summary, in English

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 further the understanding of radial migration that is a key component of the restructuring of galaxies, including the Milky Way.

Department/s

  • Lund Observatory
  • Department of Astronomy and Theoretical Physics

Publishing year

2020

Language

English

Pages

3295-3306

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

495

Issue

3

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • galaxies: evolution
  • galaxies: spiral
  • Galaxy: disc
  • Galaxy: formation
  • Galaxy: kinematics and dynamics
  • methods: numerical

Status

Published

ISBN/ISSN/Other

  • ISSN: 0035-8711