Spatio-temporal evolution of the nonresonant instability in shock precursors of young supernova remnants

Abstract

A nonresonant cosmic-ray-current-driven instability may operate in the shock precursors of young supernova remnants and be responsible for magnetic-field amplification, plasma heating and turbulence. Earlier simulations demonstrated magnetic-field amplification, and in kinetic studies a reduction of the relative drift between cosmic rays and thermal plasma was observed as backreaction. However, all published simulations used periodic boundary conditions, which do not account for mass conservation in decelerating flows and only allow the temporal development to be studied. Here we report results of fully kinetic Particle-In-Cell simulations with open boundaries that permit inflow of plasma on one side of the simulation box and outflow at the other end, hence allowing an investigation of both the temporal and the spatial development of the instability. Magnetic-field amplification proceeds as in studies with periodic boundaries and, observed here for the first time, the reduction of relative drifts causes the formation of a shock-like compression structure at which a fraction of the plasma ions are reflected. Turbulent electric field generated by the nonresonant instability inelastically scatters cosmic rays, modifying and anisotropizing their energy distribution. Spatial CR scattering is compatible with Bohm diffusion. Electromagnetic turbulence leads to significant nonadiabatic heating of the background plasma maintaining bulk equipartition between ions and electrons. The highest temperatures are reached at sites of large-amplitude electrostatic fields. Ion spectra show supra-thermal tails resulting from stochastic scattering in the turbulent electric field. Together, these modifications in the plasma flow will affect the properties of the shock and particle acceleration there.

arXiv commentAccepted for publication in MNRAS. 16 pages, 15 figures

References in corpus (32)

• On the magnetic fields and particle acceleration in Cas A
• Primary particle acceleration above 100 TeV in the shell-type Supernova Remnant RX J1713.7-3946 with deep H.E.S.S. observations
• Cosmic ray acceleration and escape from supernova remnants
• A Spatial and Spectral Study of Nonthermal Filaments in Historical Supernova Remnants: Observational Results with Chandra
• A kinetic approach to cosmic ray induced streaming instability at supernova shocks
• Discovery of TeV Gamma Ray Emission from Tycho's Supernova Remnant
• Non-linear Study of Bell's Cosmic Ray Current-driven Instability
• Production of Magnetic Turbulence by Cosmic Rays Drifting Upstream of Supernova Remnant Shocks
• Simulations of Ion Acceleration at Non-relativistic Shocks. III. Particle Diffusion
• Discovery of gamma-ray emission from the shell-type supernova remnant RCW 86 with H.E.S.S
• Modeling Bell's Non-resonant Cosmic Ray Instability
• Cosmic ray acceleration in young supernova remnants
• The transport of cosmic rays in self-excited magnetic turbulence
• Observations of the shell-type SNR Cassiopeia A at TeV energies with VERITAS
• Universal behaviour of shock precursors in the presence of efficient cosmic-ray acceleration
• Magnetic field amplification in nonlinear diffusive shock acceleration including resonant and non-resonant cosmic-ray driven instabilities
• Cosmic-ray current driven turbulence in shocks with efficient particle acceleration: the oblique, long-wavelength mode instability
• Dots, clumps and filaments: the intermittent images of synchrotron emission in random magnetic fields of young supernova remnants
• Magnetic Amplification by Magnetized Cosmic Rays in SNR Shocks
• A filamentation instability for streaming cosmic-rays
• Two-Dimensional particle-in-cell simulations of the nonresonant, cosmic-ray driven instability in SNR shocks
• A current driven instability in parallel, relativistic shocks
• The Cosmic Ray Precursor of Relativistic Collisionless Shocks: A Missing Link in Gamma-Ray Burst Afterglows
• Cosmic ray current-driven turbulence and mean-field dynamo effect
• Nonrelativistic parallel shocks in unmagnetized and weakly magnetized plasmas
• The nonlinear saturation of the non-resonant kinetically driven streaming instability
• Energy Dependence of Synchrotron X-Ray Rims in Tycho's Supernova Remnant
• Kinetic simulations of turbulent magnetic-field growth by streaming cosmic rays
• Saturated magnetic field amplification at supernova shocks
• The properties of non-thermal X-ray filaments in young supernova remnants
• Aperiodic magnetic turbulence produced by relativistic ion beams
• Basic Bell-MHD Turbulence

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