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The impact of bar origin and morphology on stellar migration

Iles, Elizabeth J; Pettitt, Alex R; Okamoto, Takashi; Kawata, Daisuke; (2024) The impact of bar origin and morphology on stellar migration. Monthly Notices of the Royal Astronomical Society , 527 (2) pp. 2799-2815. 10.1093/mnras/stad3377. Green open access

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Different mechanisms driving bar structure formation indicate that bar origins should be distinguishable in the stellar populations of galaxies. To study how these origins affect different bar morphologies and impact stellar orbits and migration, we analyse three simulated discs which are representative of bar formation under isolated evolution motivated by disc instability, and interaction driven tidal development. The first isolated disc and the tidally driven disc produce similar bar structure, while the second isolated disc, generated by the tidal initial condition without the companion, is visibly dissimilar. Changes to radial and vertical positions, angular momentum in the disc-plane, orbital eccentricity and the subsequent disc metallicities are assessed, as is the dependence on stellar age and formation radii. Bar origin is distinguishable, with the tidal disc displaying larger migration overall, higher metallicity difference between the inner and outer disc, as well as a population of inner disc stars displaced to large radii and below the disc-plane. The affect of closest approach on populations of stars formed before, after and during this period is evident. However, bar morphology is also found to be a significant factor in the evolution of disc stellar properties, with similar bars producing similar traits in migration tendency with radius, particularly in vertical stellar motion and in the evolution of central metallicity features.

Type: Article
Title: The impact of bar origin and morphology on stellar migration
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stad3377
Publisher version: https://doi.org/10.1093/mnras/stad3377
Language: English
Additional information: © The Author(s) 2023. Published by Oxford University Press on behalf of Royal Astronomical Society This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: Methods: numerical, galaxies: bar, galaxies: formation, galaxies: interactions – galaxies: kinematics and dynamics, galaxies: stellar content
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10181416
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