Double-peaked Pulse Profile of FRB 200428: Synchrotron Maser Emission from Magnetized Shocks Encountering a Density Jump

Abstract

Very recently a fast radio burst (FRB) 200428 associated with a strong X-ray burst from the Galactic magnetar SGR 1935+2154 has been detected, which is direct evidence supporting the magnetar progenitor models of FRBs. Assuming the FRB radiation mechanism is synchrotron maser emission from magnetized shocks, we develop a specific scenario by introducing a density jump structure of upstream medium, and thus the double-peaked character of FRB 200428 is a natural outcome. The luminosity and emission frequency of two pulses can be well explained in this scenario. Furthermore, we find that the synchrotron emission of shock-accelerated electrons is in the X-ray band, which therefore can be responsible for at least a portion of observed X-ray fluence. With proper upgrade, this density jump scenario can be potentially applied to FRBs with multiple peaks in the future.

6 pages, 2 figures

References in corpus (24)

• A bright millisecond radio burst of extragalactic origin
• The Host Galaxy and Redshift of the Repeating Fast Radio Burst FRB 121102
• A census of baryons in the Universe from localized fast radio bursts
• Fast Radio Bursts
• 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
• INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
• A fast radio burst localised to a massive galaxy
• A Second Source of Repeating Fast Radio Bursts
• Possible periodic activity in the repeating FRB 121102
• Nine New Repeating Fast Radio Burst Sources from CHIME/FRB
• Coherent Emission Mechanisms in Astrophysical Plasmas
• Implications of a "Fast Radio Burst" from a Galactic Magnetar
• High time resolution and polarisation properties of ASKAP-localised fast radio bursts
• The synchrotron maser emission from relativistic shocks in Fast Radio Bursts: 1D PIC simulations of cold pair plasmas
• Heating and Non-thermal Particle Acceleration in Relativistic, Transverse Magnetosonic Shock Waves in Proton-Electron-Positron Plasmas
• Radio continuum and polarization study of SNR G57.2+0.8 associated with magnetar SGR1935+2154
• Pair separation in parallel electric field in magnetar magnetosphere and narrow spectra of fast radio bursts
• On the Distance of SGR 1935+2154 Associated with FRB 200428 and Hosted in SNR G57.2+0.8
• Induced scattering of short radio pulses
• 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
• FRB 200428: an Impact between an Asteroid and a Magnetar

Cited by in corpus (12)

• The Physics of Fast Radio Bursts
• Periodic Activities of Repeating Fast Radio Bursts from Be/X-ray Binary Systems
• Reanalysis of the X-ray burst associated FRB 200428 with Insight-HXMT observations
• New Insights into the Criteria of Fast Radio Burst in the Light of FRB 20121102A
• Repeating Fast Radio Bursts with High Burst Rates by Plate Collisions in Neutron Star Crusts
• The Statistical Similarity of Repeating and Non-Repeating Fast Radio Bursts
• An Intermediate-field Fast Radio Burst Model and the Quasi-periodic Oscillation
• Hints of a universal width-energy relation for classified fast radio bursts
• Unveil A Peculiar Light Curve Pattern of Magnetar Burst with GECAM observations of SGR J1935+2154
• Fast Radio Bursts
• The Impact of Accretion on FRB Radiation Mechanisms in Binary Systems: Constraints and Implications
• Do the periodic activities of repeating fast radio bursts represent the spins of neutron stars?