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PreprintarXiv licencearXiv

Turbulent Transport of Galactic Magnetic Fields into Cosmic Voids: Insights from IllustrisTNG

  • Yuri Yamashita
  • Hiroyuki Tashiro
  • Kiyotomo Ichiki
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Abstract

Astrophysical processes associated with galaxies may contribute to the magnetization of cosmic voids. We investigate the diffusion of galactic magnetic fields in an expanding universe in the presence of turbulent magnetic diffusivity. To estimate the turbulent magnetic diffusivity, we analyze the TNG50-1 data set of the IllustrisTNG simulation and derive its redshift dependence from the characteristic turbulent velocity and turbulent scale of the intergalactic medium. Using the resulting diffusivity, we find a present-day magnetic screening length of ∼ 7 Mpc, roughly twenty times larger than previous estimates based on a constant turbulent diffusivity due to the larger turbulent scale obtained in our analysis. This scale corresponds to a significant fraction of the characteristic size of cosmic voids and suggests that galactic magnetic fields can play a more important role in void magnetization than previously estimated.

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Cite

BibTeXRIS
BibTeX
@misc{yamashita2026turbulent,
  title = {{Turbulent Transport of Galactic Magnetic Fields into Cosmic Voids: Insights from IllustrisTNG}},
  author = {Yuri Yamashita and Hiroyuki Tashiro and Kiyotomo Ichiki},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2607.09484},
  eprint = {2607.09484},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.09484},
}
RIS
TY  - UNPB
TI  - Turbulent Transport of Galactic Magnetic Fields into Cosmic Voids: Insights from IllustrisTNG
AU  - Yuri Yamashita
AU  - Hiroyuki Tashiro
AU  - Kiyotomo Ichiki
PY  - 2026
DA  - 2026/09/25
PB  - arXiv
DO  - 10.48550/arxiv.2607.09484
UR  - https://arxiv.org/abs/2607.09484
AB  - Astrophysical processes associated with galaxies may contribute to the magnetization of cosmic voids. We investigate the diffusion of galactic magnetic fields in an expanding universe in the presence of turbulent magnetic diffusivity. To estimate the turbulent magnetic diffusivity, we analyze the TNG50-1 data set of the IllustrisTNG simulation and derive its redshift dependence from the characteristic turbulent velocity and turbulent scale of the intergalactic medium. Using the resulting diffusivity, we find a present-day magnetic screening length of ∼ 7 Mpc, roughly twenty times larger than previous estimates based on a constant turbulent diffusivity due to the larger turbulent scale obtained in our analysis. This scale corresponds to a significant fraction of the characteristic size of cosmic voids and suggests that galactic magnetic fields can play a more important role in void magnetization than previously estimated.
ER  -