Recovering 3D Magnetic Turbulence from Single-Frequency Faraday Screens
Aliaksandr Melnichenka Alex Lazarian Dmitri Pogosyan
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Abstract
Statistics of polarized synchrotron radiation carry information about the properties of the underlying turbulence. Different statistical measures constructed from observables probe turbulence properties in different ways. 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 screen. We compare these results with our analytical expectations. We also compare the spectrum of polarization direction (SPD) with the wavelength-derivative diagnostic introduced and analytically explored by Lazarian \& Pogosyan. We demonstrate that the SPD exhibits greater sensitivity to turbulence in the Faraday screen. We provide an observer-friendly criterion to determine whether the SPD samples turbulence in the synchrotron-emitting region or in the Faraday screen. These results open a practical pathway for extracting turbulence statistics from existing and forthcoming single-band radio polarimetry.引用本文复制引用
Aliaksandr Melnichenka,Alex Lazarian,Dmitri Pogosyan.Recovering 3D Magnetic Turbulence from Single-Frequency Faraday Screens[EB/OL].(2026-02-25)[2026-02-28].https://arxiv.org/abs/2602.22204.学科分类
天文学
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