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    Internally driven warps in disc galaxies

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    Author
    Sellwood, J.A.
    Debattista, V.P.
    Affiliation
    Steward Observatory, University of Arizona
    Issue Date
    2022
    Keywords
    galaxies: evolution
    galaxies: kinematics and dynamics
    galaxies: spiral
    galaxies: structure
    
    Metadata
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    Publisher
    Oxford University Press
    Citation
    Sellwood, J. A., & Debattista, V. P. (2022). Internally driven warps in disc galaxies. Monthly Notices of the Royal Astronomical Society.
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    Copyright © 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Any perturbation to a disc galaxy that creates a misalignment between the planes of the inner and outer disc, will excite a slowly evolving bending wave in the outer disc. The torque from the stiff inner disc drives a retrograde, leading spiral bending wave that grows in amplitude as it propagates outwards over a period of several Gyr. The part of the disc left behind by the outwardly propagating wave is brought into alignment with the inner disc. This behaviour creates warps that obey the rules established from observations, and operates no matter what the original cause of the misalignment between the inner and outer disc. Here, we confirm that mild warps in simulations of disc galaxies can be excited by shot noise in the halo, as was recently reported. We show that the quadrupole component of the noise creates disc distortions most effectively. Bending waves caused by shot noise in carefully constructed equilibrium simulations of isolated galaxies are far too mild to be observable, but perturbations from halo substructure and galaxy assembly must excite larger amplitude bending waves in real galaxies. © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
    Note
    Immediate access
    ISSN
    0035-8711
    DOI
    10.1093/mnras/stab3433
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stab3433
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    UA Faculty Publications

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