Conversion Measure of Faraday Rotation-Conversion with application to Fast Radio Bursts

Abstract

Faraday Rotation-Conversion is the simultaneous rotation of all three Stokes polarization parameters $Q$, $U$, $V$ as an electromagnetic wave propagates through a magnetized plasma. In this regime the Faraday plasma screen is characterized by more than just a Rotation Measure. We define the Conversion Measure that characterizes the wavelength-dependent conversion between the linear and circular polarization. In a cold plasma, the conversion occurs at the localized regions along the wave's path, where the large-scale magnetic field is perpendicular to the propagation direction. The number of these regions along the line of sight through the screen, and their individual contributions to the conversion measure, can be inferred from the polarization measurements. We argue that the simultaneous measurement of wavelength-dependent linear and circular polarization might give an important insight into the magnetic-field geometry of the Faraday screen in FRB121102 and other repeating Fast Radio Bursts.

7 pages, 3 fugures. References added, with explicit attribution to Zheleznyakov & Zlotnik (1964) for one important equation. Accepted to ApJ

References in corpus (14)

• A Repeating Fast Radio Burst
• The direct localization of a fast radio burst and its host
• Fast Radio Burst Discovered in the Arecibo Pulsar ALFA Survey
• An extreme magneto-ionic environment associated with the fast radio burst source FRB 121102
• A flaring magnetar in FRB 121102?
• A concordance picture of FRB 121102 as a flaring magnetar embedded in a magnetized ion-electron wind nebula
• On the origin of fast radio bursts (FRBs)
• Detection of Circular Polarization in the Galactic Center Black Hole Candidate Sagittarius A*
• MOJAVE: Monitoring of Jets in AGN with VLBA Experiments - II. First-Epoch 15 GHz Circular Polarization Results
• Circular polarization from stochastic synchrotron sources
• Faraday conversion and magneto-ionic variations in Fast Radio Bursts
• Understanding the Geometry of Astrophysical Magnetic Fields
• Giant Primeval Magnetic Dipoles
• Faraday rotation: effect of magnetic field reversals

Cited by in corpus (29)

• Fast Radio Bursts
• The Physics of Fast Radio Bursts
• Blast Waves from Magnetar Flares and Fast Radio Bursts
• LOFAR Detection of 110-188 MHz Emission and Frequency-Dependent Activity from FRB 20180916B
• Rotation Measure Evolution of the Repeating Fast Radio Burst Source FRB 121102
• Repeating fast radio burst 20201124A originates from a magnetar/Be star binary
• Constraints on the Engines of Fast Radio Bursts
• Polarization properties of FRB 20201124A from detections with the 100-m Effelsberg Radio Telescope
• Faraday depolarization and induced circular polarization by multi-path propagation with application to FRBs
• Temporal Scattering, Depolarization, and Persistent Radio Emission from Magnetized Inhomogeneous Environments Near Repeating Fast Radio Burst Sources
• Revealing the Dynamic Magneto-ionic Environments of Repeating Fast Radio Burst Sources through Multi-year Polarimetric Monitoring with CHIME/FRB
• Polarization of Fast Radio Bursts: radiation mechanisms and propagation effects
• FRB 121102: drastic changes in the burst polarization contrasts with the stability of the persistent emission
• A Highly Variable Magnetized Environment in a Pulsar Binary resembling Fast Radio Bursts
• Spectropolarimetric variability in the repeating fast radio burst source FRB 20180301A
• Circular Polarization in two Active Repeating Fast Radio Bursts
• Deep Synoptic Array Science: Polarimetry of 25 New Fast Radio Bursts Provides Insights into their Origins
• A fast radio burst localized at detection to an edge-on galaxy using very-long-baseline interferometry
• Linear to circular conversion in the polarized radio emission of a magnetar
• A highly magnetized long-period radio transient exhibiting unusual emission features
• Propagation of a fast radio burst through a birefringent relativistic plasma
• Scintillation can explain the spectral structure of the bright radio burst from SGR 1935+2154
• Faraday conversion in pair-symmetric winds of magnetars and Fast Radio Bursts
• On the Circular Polarisation of Repeating Fast Radio Bursts
• Deep Synoptic Array Science: Implications of Faraday Rotation Measures of Localized Fast Radio Bursts
• Circular polarization of cosmic photons due to their interactions with Sterile neutrino dark matter
• Polarised radiative transfer, rotation measure fluctuations and large-scale magnetic fields
• Comprehensive analysis of the Apertif Fast Radio Burst sample: similarities with young, energetic neutron stars
• A Polarization Pipeline for Fast Radio Bursts Detected by CHIME/FRB