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Abstract <p>Large-scale magnetic fields at moderate distances from the center of galaxies (up to 8–10&#xa0;kpc) are generated by the action of the mean-field dynamo mechanism, and their existence is confirmed by measurements of Faraday rotation. At the same time, the question arises as to the possibility of the existence of fields in outer regions, where the action of the dynamo should be noticeably suppressed. This suggests that other mechanisms of magnetic field generation must become dominant. In&#xa0;this paper, the behavior of large-scale magnetic field disturbances is studied using spectral analysis. Field growth indicators and their typical profiles are obtained. The role of magnetorotational instability in the process of field propagation from the central regions to the periphery of the galaxy is also discussed. Finally, estimates are made for a small-scale field, which, although it has a near-zero mean, can have an energy comparable to the kinetic energy of turbulent motions in the medium.</p>

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Possible Mechanisms of Magnetic Field Generation in Outer Parts of Galaxies

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • E. A. Mikhailov,
  • T. T. Khasaeva,
  • R. Zhang,
  • X. Liu

摘要

Abstract

Large-scale magnetic fields at moderate distances from the center of galaxies (up to 8–10 kpc) are generated by the action of the mean-field dynamo mechanism, and their existence is confirmed by measurements of Faraday rotation. At the same time, the question arises as to the possibility of the existence of fields in outer regions, where the action of the dynamo should be noticeably suppressed. This suggests that other mechanisms of magnetic field generation must become dominant. In this paper, the behavior of large-scale magnetic field disturbances is studied using spectral analysis. Field growth indicators and their typical profiles are obtained. The role of magnetorotational instability in the process of field propagation from the central regions to the periphery of the galaxy is also discussed. Finally, estimates are made for a small-scale field, which, although it has a near-zero mean, can have an energy comparable to the kinetic energy of turbulent motions in the medium.