Rotation and dispersion measure evolution of repeating fast radio bursts propagating through a magnetar flare ejecta

Abstract

Rotation measure (RM) and dispersion measure (DM) are characteristic properties of fast radio bursts (FRBs) that contain important information of their source environment. The time evolution of RM and DM is more inclined to be ascribed to local plasma in the host galaxy rather than the intergalactic medium or free electrons in the Milky Way. Recently a sudden drastic RM change was reported for an active repeating FRB 20220529, implying that some kind of mass ejection happened near the source. In this work I suggest that magnetar flare ejecta could play this role and give rise to the significant RM change. I introduce a toy structured ejecta model and calculate the contribution to RM and DM by a typical flare event. I find that this model could reproduce the RM behaviour of FRB 20220529 well under reasonable parameters, and similar sudden change is expected as long as this source maintains its activity.

arXiv comment6 pages, 8 figures, A&A Letters accepted

References in corpus (26)

• A bright millisecond radio burst of extragalactic origin
• Magnetars
• Time-dependent force-free pulsar magnetospheres: axisymmetric and oblique rotators
• A fast radio burst associated with a Galactic magnetar
• A bright millisecond-duration radio burst from a Galactic magnetar
• INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
• HXMT Identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428
• Explosive reconnection in magnetars
• The Physics of Fast Radio Bursts
• A peculiar hard X-ray counterpart of a Galactic fast radio burst
• A concordance picture of FRB 121102 as a flaring magnetar embedded in a magnetized ion-electron wind nebula
• A fast radio burst source at a complex magnetised site in a barred galaxy
• Ab-initio pulsar magnetosphere: three-dimensional particle-in-cell simulations of oblique pulsars
• Three-dimensional numerical simulations of the pulsar magentoshere: Preliminary results
• The discovery, monitoring and environment of SGR J1935+2154
• The Physics of Fast Radio Bursts
• Magnetic field reversal in the turbulent environment around a repeating fast radio burst
• Repeating fast radio burst 20201124A originates from a magnetar/Be star binary
• The NICER View of the 2020 Burst Storm and Persistent Emission of SGR 1935+2154
• Dispersion Measure Variation of Repeating Fast Radio Burst Sources
• A Re-brightening of the Radio Nebula associated with the 2004 December 27 giant flare from SGR 1806--20
• A radio pulsar phase from SGR J1935+2154 provides clues to the magnetar FRB mechanism
• Faraday Rotation Measure Variations of Repeating Fast Radio Burst Sources
• Rotation Measure Variations and Reversals of Repeating Fast Radio Bursts in Massive Binary Systems
• Fermi-GBM Observations of the SGR J1935+2154 Burst Forest
• Kilonova emission from black hole-neutron star mergers: observational signatures of anisotropic mass ejection