Revealing the Dynamic Magneto-ionic Environments of Repeating Fast Radio Burst Sources through Multi-year Polarimetric Monitoring with CHIME/FRB

Abstract

Fast radio bursts (FRBs) display a confounding variety of burst properties and host galaxy associations. Repeating FRBs offer insight into the FRB population by enabling spectral, temporal and polarimetric properties to be tracked over time. Here, we report on the polarized observations of 12 repeating sources using multi-year monitoring with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) over 400-800 MHz. We observe significant RM variations from many sources in our sample, including RM changes of several hundred $\mathrm{rad}{\mathrm{m}}^{-2}$ over month timescales from FRBs 20181119A, 20190303A and 20190417A, and more modest RM variability ($\mathrm{\Delta RM}\lesssim$ few tens rad m${}^{-2}$) from FRBs 20181030A, 20190208A, 20190213B and 20190117A over equivalent timescales. Several repeaters display a frequency dependent degree of linear polarization that is consistent with depolarization via scattering. Combining our measurements of RM variations with equivalent constraints on DM variability, we estimate the average line-of-sight magnetic field strength in the local environment of each repeater. In general, repeating FRBs display RM variations that are more prevalent/extreme than those seen from radio pulsars in the Milky Way and the Magellanic Clouds, suggesting repeating FRBs and pulsars occupy distinct magneto-ionic environments.

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• Spectropolarimetric variability in the repeating fast radio burst source FRB 20180301A
• Deep Synoptic Array Science: Polarimetry of 25 New Fast Radio Bursts Provides Insights into their Origins
• Linearly-polarized Coherent Emission from Relativistic Magnetized Ion-electron Shocks
• CHIME/FRB/Pulsar discovery of a nearby long period radio transient with a timing glitch
• A Comprehensive Analysis on Repeating Fast Radio Bursts
• Deep Synoptic Array Science: Implications of Faraday Rotation Measures of Localized Fast Radio Bursts
• Multi-year Polarimetric Monitoring of Four CHIME-Discovered Repeating Fast Radio Bursts with FAST
• The Curious Case of Twin Fast Radio Bursts: Evidence for Neutron Star Origin?
• Rotation Measure study of FRB 20180916B with the uGMRT
• A Spatial Gap in the Sky Distribution of Fast Radio Burst Detections Coinciding with Galactic Plasma Overdensities