Filamentation of the electromagnetic precursor in relativistic quasi-perpendicular electron-positron shocks

Abstract

We present a scenario that could explain non-thermal particle acceleration in relativistic quasi-perpendicular electron-positron shocks, such as the termination shock of pulsar wind nebulae. The shock produces a strong electromagnetic precursor that propagates into the upstream plasma, which is initially threaded by a uniform background magnetic field. We show that the filamentation instability breaks the precursor into radiation filaments parallel to the shock normal. The transverse scale of the filaments is of the order of a few plasma skin depths. In the shock frame, the bulk Lorentz factor of the upstream plasma is significantly reduced inside the radiation filaments. Then, the instability produces a relativistic shear flow with strong velocity gradients on kinetic scales. The velocity gradients distort the background magnetic field lines, and generate a magnetic field component parallel to the shock normal that reverses across each radiation filament, a configuration that could trigger magnetic reconnection in the upstream plasma. These effects may accelerate particles before the plasma enters the shock.

arXiv commentaccepted for publication by A&A

References in corpus (36)

• The Evolution and Structure of Pulsar Wind Nebulae
• Reconnection in a striped pulsar wind
• Discovery of Spatial and Spectral Structure in the X-Ray Emission from the Crab Nebula
• Particle Acceleration in Relativistic Magnetized Collisionless Pair Shocks: Dependence of Shock Acceleration on Magnetic Obliquity
• Acceleration of Particles at the Termination Shock of a Relativistic Striped Wind
• Dissipation in Poynting-flux Dominated Flows: the Sigma-Problem of the Crab Pulsar Wind
• The surprising Crab pulsar and its nebula: A review
• Modeling the spectral evolution of PWNe inside SNRs
• Three-Dimensional Magnetohydrodynamic Simulations of the Crab Nebula
• Axially symmetric relativistic MHD simulations of Pulsar Wind Nebulae in Supernova Remnants - On the origin of torus and jet-like features
• The termination shock in a striped pulsar wind
• On the polar cap cascade pair multiplicity of young pulsars
• Simulated synchrotron emission from Pulsar Wind Nebulae
• The origin of peculiar jet-torus structure in the Crab nebula
• 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
• Particle acceleration in the driven relativistic reconnection
• Pulsar-Wind Nebulae: Recent Progress in Observations and Theory
• Constraints on the Engines of Fast Radio Bursts
• On the maximum pair multiplicity of pulsar cascades
• Pulsar-wind nebulae and magnetar outflows: observations at radio, X-ray, and gamma-ray wavelengths
• Coherent Electromagnetic Emission from Relativistic Magnetized Shocks
• Dissipation of the striped pulsar wind and non-thermal particle acceleration: 3D PIC simulations
• Constraints on particle acceleration sites in the Crab Nebula from relativistic MHD simulations
• Persistence of precursor waves in two-dimensional relativistic shocks
• Precursor Wave Emission Enhanced by Weibel Instability in Relativistic Shocks
• The synchrotron maser emission from relativistic magnetized shocks: Dependence on the pre-shock temperature
• A global model of particle acceleration at pulsar wind termination shocks
• Self-modulation of Fast Radio Bursts
• Linearly-polarized Coherent Emission from Relativistic Magnetized Ion-electron Shocks
• Saturation of the filamentation instability and dispersion measure of Fast Radio Bursts
• Filamentation of Fast Radio Bursts in magnetar winds
• Nonlinear electromagnetic-wave interactions in pair plasma: (I) Non-relativistic regime
• Escape of fast radio bursts from magnetars
• Interaction of the electro-magnetic precursor from a relativistic shock with the upstream flow. I. Synchrotron absorption of strong electromagnetic waves
• Kinetic Simulations of the Filamentation Instability in Pair Plasmas