Frequency-dependent polarization of repeating fast radio bursts-implications for their origin

Understand

The polarization of fast radio bursts (FRBs), bright astronomical transients, contains crucial information about their environments.

• We report polarization measurements of five repeating FRBs, the abundant signals of which enable wide-band observations with two telescopes.
• A clear trend of lower polarization at lower frequencies was found, which can be well characterized by a single parameter rotation-measure-scatter ({\sigma}RM) and modeled by multi-path scatter.
• Sources with higher {\sigma}RM have higher RM magnitude and scattering timescales.