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Abstract <p>Trajectories of test particles in a time-varying nonspherical gravitational potential model of our Galaxy have been considered. The role of the quadrupole component of the potential, which at distances greater than 50 kpc is associated with the distribution of matter in the Galaxy’s neighborhood (mainly with the influence of the galaxy M31), has been studied. It has been shown that perturbations of the potential created by the environment can significantly change the trajectories of particles at distances greater than 100 kpc from the Galactic center, but the magnitude of this effect depends on the still poorly known trajectory of the galaxy M31. For some variants of this trajectory, structures resembling a “thin plane” of satellite galaxies cannot exist for more than 2–3 billion years.</p>

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Stability of the Milky Way Satellite Galaxy Plane under the Influence of Neighbors

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • S. V. Pilipenko,
  • N. R. Arakelyan

摘要

Abstract

Trajectories of test particles in a time-varying nonspherical gravitational potential model of our Galaxy have been considered. The role of the quadrupole component of the potential, which at distances greater than 50 kpc is associated with the distribution of matter in the Galaxy’s neighborhood (mainly with the influence of the galaxy M31), has been studied. It has been shown that perturbations of the potential created by the environment can significantly change the trajectories of particles at distances greater than 100 kpc from the Galactic center, but the magnitude of this effect depends on the still poorly known trajectory of the galaxy M31. For some variants of this trajectory, structures resembling a “thin plane” of satellite galaxies cannot exist for more than 2–3 billion years.