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Internal kinematics of dwarf galaxies orbitally moving in ultralight dark matter

E. V. Gorbar1,2, A. I. Momot1, and O. M. Teslyk1

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Phys. Rev. D 114, 083028 – Published 14 October, 2026

DOI: https://doi.org/10.1103/3fj9-tdnw

Abstract

For dwarf galaxies modeled as deformed Plummer spheres and orbitally moving in ultralight dark matter halo of the Milky Way, the torque induced by the dynamical friction force is determined and obtained to be much smaller than the torque produced by the gravitational force of the Milky Way. As to the tidal torque, it is found that its magnitude differs significantly for the Plummer and Gaussian density profiles of ultralight dark matter. Possible oscillations of dwarf galaxies caused by the tidal torque and misalignment of dwarf galaxies with respect to their equilibrium position are investigated. It is suggested that more accurate measurements of dwarf-galaxy rotation velocities and improved modeling of dark matter distributions could provide useful constraints on the nature and properties of dark matter.

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Information

Phys. Rev. D 114, 083028– Published 14 October, 2026
  • Received 30 November 2025
  • Revised 15 June 2026
  • Accepted 13 August 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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