The Statistical Polarization Properties of Coherent Curvature Radiation by Bunches: Application to Fast Radio Burst Repeaters
arXiv:2212.13153 · doi:10.3847/1538-4357/acac23
Abstract
Fast radio bursts (FRBs) are extragalactic radio transients with millisecond duration and extremely high brightness temperature. Very recently, some highly circularly polarized bursts were found in a repeater, FRB 20201124A. The significant circular polarization might be produced by coherent curvature radiation by bunches with the line of sight (LOS) deviating from the bunch central trajectories. In this work, we carry out simulations to study the statistical properties of burst polarization within the framework of coherent curvature radiation by charged bunches in the neutron star magnetosphere for repeating FRBs. The flux is almost constant within the opening angle of the bunch. However, when the LOS derivates from the bunch opening angle, the larger the derivation, the larger the circular polarization but the lower the flux. We investigate the statistical distribution of circular polarization and flux of radio bursts from an FRB repeater, and find that most of the bursts with high circular polarization have a relatively low flux. Besides, we find that most of the depolarization degrees of bursts have a small variation in a wide frequency band. Furthermore, we simulate the polarization angle (PA) evolution and find that most bursts show a flat PA evolution within the burst phases, and some bursts present a swing of PA.
12 pages, 13 figures, accepted for publication in ApJ
References in corpus (30)
- A bright millisecond radio burst of extragalactic origin
- Fast radio bursts as synchrotron maser emission from decelerating relativistic blast waves
- The Physical Mechanisms of Fast Radio Bursts
- A repeating fast radio burst associated with a persistent radio source
- Nine New Repeating Fast Radio Burst Sources from CHIME/FRB
- A fast radio burst source at a complex magnetised site in a barred galaxy
- Diverse polarization angle swings from a repeating fast radio burst source
- LOFAR Detection of 110-188 MHz Emission and Frequency-Dependent Activity from FRB 20180916B
- High time resolution and polarisation properties of ASKAP-localised fast radio bursts
- The Physics of Fast Radio Bursts
- Frequency-dependent polarization of repeating fast radio bursts-implications for their origin
- On the Time-Frequency Downward Drifting of Repeating Fast Radio Bursts
- Fast radio bursts and their high-energy counterpart from magnetar magnetospheres
- Coherent inverse Compton scattering by bunches in fast radio bursts
- Magnetospheric curvature radiation by bunches as emission mechanism for repeating fast radio bursts
- Polarization properties of FRB 20201124A from detections with the 100-m Effelsberg Radio Telescope
- Circularly polarized radio emission from the repeating fast radio burst source FRB 20201124A
- Simultaneous multi-telescope observations of FRB 121102
- Faraday depolarization and induced circular polarization by multi-path propagation with application to FRBs
- FAST observations of an extremely active episode of FRB 20201124A: III. Polarimetry
- Temporal Scattering, Depolarization, and Persistent Radio Emission from Magnetized Inhomogeneous Environments Near Repeating Fast Radio Burst Sources
- On the magnetospheric origin of Repeating Fast Radio Bursts
- FRB 121102: drastic changes in the burst polarization contrasts with the stability of the persistent emission
- An analysis of the time-frequency structure of several bursts from FRB121102 detected with MeerKAT
- Coherent curvature radiation: maximum luminosity and high-energy emission
- Polarisation of magnetospheric curvature radiation in repeating fast radio bursts
- Multiband Detection of Repeating FRB 20180916B
- On frequency dependence of pulsar linear polarization
- Circular polarization of fast radio bursts in the curvature radiation scenario
- Repeating Fast Radio Bursts from Pulsar-Asteroid Belt Collisions: Frequency Drifting and Polarization
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- Polarization of Fast Radio Bursts: radiation mechanisms and propagation effects
- Narrow spectra of repeating fast radio bursts: A magnetospheric origin
- Multi-year Polarimetric Monitoring of Four CHIME-Discovered Repeating Fast Radio Bursts with FAST
- Coherent Curvature Radiation Spectrum by Dynamically Fluctuating Bunches in Magnetospheres
- Tera-Hertz Counterparts to Fast Radio Bursts from Coherent Cherenkov Radiation by Tilted Bunches
- The Impact of Accretion on FRB Radiation Mechanisms in Binary Systems: Constraints and Implications