Pair separation in parallel electric field in magnetar magnetosphere and narrow spectra of fast radio bursts

Abstract

When the magnetosphere of a magnetar is perturbed by crustal deformation, an electric field $E_{\parallel }$ parallel to the magnetic field line would appear via Alvfén waves in the charge starvation region. The electron-positron pair bunches will be generated via two-stream instability in the magnetosphere, and these pairs will undergo charge separation in the $E_{\parallel }$ and in the meantime emit coherent curvature radiation. Following the approach of Yang & Zhang (2018), we find that the superposed curvature radiation becomes narrower due to charge separation, with the width of spectrum depending on the separation between the electron and positron clumps. This mechanism can interpret the narrow spectra of FRBs, in particular, the spectrum of Galactic FRB 200428 recently detected in association with a hard X-ray burst from the Galactic magnetar SGR J1935+2154.

7 pages, 3 figures, accepted for publication in ApJL

References in corpus (22)

• A bright millisecond radio burst of extragalactic origin
• The direct localization of a fast radio burst and its host
• Transient pulsed radio emission from a magnetar
• Fast radio bursts as synchrotron maser emission from decelerating relativistic blast waves
• A repeating fast radio burst source localised to a nearby spiral galaxy
• A single fast radio burst localized to a massive galaxy at cosmological distance
• Corona of Magnetars
• INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
• A fast radio burst localised to a massive galaxy
• Untwisting magnetospheres of neutron stars
• 1E 1547.0-5408: a radio-emitting magnetar with a rotation period of 2 seconds
• A "Cosmic Comb" Model of Fast Radio Bursts
• Implications of a "Fast Radio Burst" from a Galactic Magnetar
• Local Circumnuclear Magnetar Solution to Extragalactic Fast Radio Bursts
• On the Time-Frequency Downward Drifting of Repeating Fast Radio Bursts
• A Magnetar-Asteroid Impact Model for FRB 200428 Associated with an X-ray Burst from SGR 1935+2154
• On the magnetospheric origin of Repeating Fast Radio Bursts
• An X-Ray Burst from a Magnetar Enlightening the Mechanism of Fast Radio Bursts
• Fast Radio Bursts from reconnection events in magnetar magnetospheres
• A unified picture of Galactic and cosmological fast radio bursts
• Coherent radio emission from a twisted magnetosphere after magnetar-quake
• The radio/X-ray burst from SGR 1935+2154: radiation mechanisms and the possible QPOs

Cited by in corpus (38)

• The Physical Mechanisms of Fast Radio Bursts
• The Physics of Fast Radio Bursts
• The Physics of Fast Radio Bursts
• Coherent inverse Compton scattering by bunches in fast radio bursts
• Magnetospheric curvature radiation by bunches as emission mechanism for repeating fast radio bursts
• Quasi-periodic oscillations of the X-ray burst from the magnetar SGR J1935+2154 and associated with the fast radio burst FRB 200428
• Periodic Activities of Repeating Fast Radio Bursts from Be/X-ray Binary Systems
• Can a Single Population Account for the Discriminant Properties in Fast Radio Bursts?
• Emission Properties of Periodic Fast Radio Bursts from the Motion of Magnetars: Testing Dynamical Models
• Revisit the periodicity of SGR J1935+2154 bursts with updated sample
• "Slow" Radio Bursts from Galactic Magnetars?
• Evidence for Coherent Curvature Radiation in PSR J1645$-$0317 with Disordered Distribution of Polarization Position Angle
• Reanalysis of the X-ray burst associated FRB 200428 with Insight-HXMT observations
• Double-peaked Pulse Profile of FRB 200428: Synchrotron Maser Emission from Magnetized Shocks Encountering a Density Jump
• Repeating Fast Radio Bursts with High Burst Rates by Plate Collisions in Neutron Star Crusts
• Narrow spectra of repeating fast radio bursts: A magnetospheric origin
• The plasma suppression effect can be ignored in realistic FRB models invoking bunched coherent radio emission
• Testing afterglow models of FRB 200428 with early post-burst observations of SGR 1935+2154
• Coherent Curvature Radiation Spectrum by Dynamically Fluctuating Bunches in Magnetospheres
• FRB$-$SRB$-$XRB: Geometric and Relativistic Beaming Constraints of Fast Radio Bursts from the Galactic Magnetar SGR J1935+2154
• Hyper-active repeating fast radio bursts from rotation modulated starquakes on magnetars
• Linear acceleration emission of pulsar relativistic streaming instability and interacting plasma bunches
• An Intermediate-field Fast Radio Burst Model and the Quasi-periodic Oscillation
• Scattering Cross Sections of Magnetized Particles within Intense Electromagnetic Waves: Application to Fast Radio Bursts
• Repeating Fast Radio Bursts from Pulsar-Asteroid Belt Collisions: Frequency Drifting and Polarization
• Unveil A Peculiar Light Curve Pattern of Magnetar Burst with GECAM observations of SGR J1935+2154
• Fast Radio Bursts
• Streaming instability in neutron star magnetospheres: No indication of soliton-like waves
• Upper Field Strength Limit of Fast Radio Bursts
• The radio/X-ray burst from SGR 1935+2154: radiation mechanisms and the possible QPOs
• Periodic Activities of Fast Radio Burst Repeaters from Precessing Magnetars with Evolving Obliquity
• Theoretical Radio Signals from Radio-Band Gravitational Waves Converted from the Neutron Star Magnetic Field
• Emission Mechanisms of Fast Radio Bursts
• Optical Transients from Fast Radio Bursts Heating Companion Stars in Close Binary Systems
• Do the periodic activities of repeating fast radio bursts represent the spins of neutron stars?
• The Impact of Accretion on FRB Radiation Mechanisms in Binary Systems: Constraints and Implications
• Understanding FRB 200428 in the synchrotron maser shock model: consistency and possible challenge
• Radiation Reaction effects on Coherent Emission in Relativistic Magnetized Shocks