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Peer-reviewedCC BY 4.0The Astrophysical Journal

Recovering 3D Magnetic Turbulence from Single-frequency Faraday Screens

  • A. Melnichenka1
  • A. Lazarian2
  • D. Pogosyan3
  1. 1Berea College
  2. 2University of Wisconsin–Madison
  3. 3University of Alberta
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Abstract

Statistics of polarized synchrotron radiation carry information about the properties of the underlying turbulence. We consider a setup in which synchrotron radiation is emitted in a distant volume and then passes through a turbulent screen that induces Faraday rotation. Using both MHD simulations and synthetic turbulence spectra, we explore the spectrum of observed polarization directions measured at a single frequency as a diagnostic for recovering the statistics of turbulence in both the emitting region and the Faraday rotation volume. We compare these results with our analytical expectations. In doing so, we compare the directional spectrum with the wavelength-derivative diagnostic explored earlier by Lazarian & Pogosyan. We demonstrate that the directional spectrum exhibits greater sensitivity to the turbulence in the Faraday rotation volume. We provide an observer-friendly criterion to determine whether it samples turbulence in the synchrotron-emitting region or in the Faraday rotation region. These results open a practical pathway for extracting turbulence statistics from existing and forthcoming single-band radio polarimetry.

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Cite

BibTeXRIS
BibTeX
@article{melnichenka2026recovering,
  title = {{Recovering 3D Magnetic Turbulence from Single-frequency Faraday Screens}},
  author = {A. Melnichenka and A. Lazarian and D. Pogosyan},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-4357/aeac22},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aeac22},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Recovering 3D Magnetic Turbulence from Single-frequency Faraday Screens
AU  - A. Melnichenka
AU  - A. Lazarian
AU  - D. Pogosyan
PY  - 2026
DA  - 2026/10/21
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aeac22
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aeac22
AB  - Statistics of polarized synchrotron radiation carry information about the properties of the underlying turbulence. We consider a setup in which synchrotron radiation is emitted in a distant volume and then passes through a turbulent screen that induces Faraday rotation. Using both MHD simulations and synthetic turbulence spectra, we explore the spectrum of observed polarization directions measured at a single frequency as a diagnostic for recovering the statistics of turbulence in both the emitting region and the Faraday rotation volume. We compare these results with our analytical expectations. In doing so, we compare the directional spectrum with the wavelength-derivative diagnostic explored earlier by Lazarian & Pogosyan. We demonstrate that the directional spectrum exhibits greater sensitivity to the turbulence in the Faraday rotation volume. We provide an observer-friendly criterion to determine whether it samples turbulence in the synchrotron-emitting region or in the Faraday rotation region. These results open a practical pathway for extracting turbulence statistics from existing and forthcoming single-band radio polarimetry.
SN  - 0004-637X
SN  - 1538-4357
ER  -