Magnetic field amplification in supernova remnants
arXiv:1710.07717 · doi:10.3847/1538-4357/aa956b
Abstract
Based on the new findings on the turbulent dynamo in \citet{XL16}, we examine the magnetic field amplification in the context of supernova remnants. Due to the strong ion-neutral collisional damping in the weakly-ionized interstellar medium, the dynamo in the preshock turbulence remains in the damping kinematic regime, which leads to {\it a linear-in-time growth of the magnetic field strength}. The resultant magnetic field structure enables effective diffusion upstream and shock acceleration of cosmic rays to energies above the "knee". Differently, the nonlinear dynamo in the postshock turbulence leads to {\it a linear-in-time growth of the magnetic energy} due to the turbulent magnetic diffusion. Given a weak initial field strength in the postshock region, the magnetic field saturates at a significant distance from the shock front as a result of the inefficiency of the nonlinear dynamo. This result is in a good agreement with existing numerical simulations and well explains the X-ray spots detected far behind the shock front.
8 pages, 2 figures, accepted for publication in ApJ
References in corpus (46)
- Astrophysical magnetic fields and nonlinear dynamo theory
- Reconnection in a Weakly Stochastic Field
- The Anisotropy of MHD Alfvénic Turbulence
- The Millennium Arecibo 21-CM Absorption Line Survey. II. Properties of the Warm and Cold Neutral Media
- Simulations of Incompressible MHD Turbulence
- Supernova remnants: the X-ray perspective
- Compressible Turbulence in Galaxy Clusters: Physics and Stochastic Particle Re-acceleration
- Diffuse Galactic Emission from Spinning Dust Grains
- Turbulent molecular clouds
- Simulations of nonhelical hydromagnetic turbulence
- The earliest phases of high-mass star formation: a 3 square degree millimeter continuum mapping of Cygnus X
- Fine Structures of Shock of SN 1006 with the Chandra Observation
- A Spatial and Spectral Study of Nonthermal Filaments in Historical Supernova Remnants: Observational Results with Chandra
- Extending Big Power Law in the Sky with Turbulence Spectra from WHAM data
- Turbulence and Magnetic Field Amplification in Supernova Remnants: Interactions Between A Strong Shock Wave and Multi-Phase Interstellar Medium
- Magnetic Field Structure and Stochastic Reconnection in a Partially Ionized Gas
- Enhancement and suppression of heat transfer by MHD turbulence
- A model of nonlinear evolution and saturation of the turbulent MHD dynamo
- Turbulence-induced magnetic fields and the structure of Cosmic Ray modified shocks
- Stochastic reacceleration of relativistic electrons by turbulent reconnection: a mechanism for cluster-scale radio emission ?
- Growth of Magnetic Fields Induced by Turbulent Motions
- Superdiffusion of Cosmic Rays: Implications for Cosmic Ray Acceleration
- Fast Variability of Nonthermal X-Ray Emission in Cassiopeia A: Probing Electron Acceleration in Reverse-Shocked Ejecta
- Collisions, magnetization, and transport coefficients in the lower solar atmosphere
- Obtaining Spectra of Turbulent Velocity from Observations
- Universal Nonlinear Small-Scale Dynamo
- Chandra Observations of A Galactic Supernova Remnant Vela Jr.: A New Sample of Thin Filaments Emitting Synchrotron X-Rays
- New Regime of MHD Turbulence: Cascade Below Viscous Cutoff
- Mechanism for spectral break in cosmic ray proton spectrum from Supernova remnant W44
- On the Amplification of Magnetic Field by a Supernova Blast Shock Wave in a Turbulent Medium
- Turbulent dynamo in a conducting fluid and partially ionized gas
- Damping of MHD turbulence in partially ionized plasma: implications for cosmic ray propagation
- Turbulent magnetic field amplification driven by cosmic-ray pressure gradients
- Ordinary and Viscosity-Damped MHD Turbulence
- The Evolution of Adiabatic Supernova Remnants in a Turbulent, Magnetized Medium
- Turbulent amplification of magnetic field driven by dynamo effect at rippled shocks
- Amplification of Interstellar Magnetic Fields and Turbulent Mixing by Supernova-Driven Turbulence Part II - The Role of Dynamical Chaos
- Scatter broadening of pulsars and implications on the interstellar medium turbulence
- Small-Scale X-ray Variability in the Cassiopeia A Supernova Remnant
- Plasma Diagnostics of the Interstellar Medium with Radio Astronomy
- The Efficiency of Magnetic Field Amplification at Shocks by Turbulence
- Adiabatic non-resonant acceleration in magnetic turbulence and hard spectra of gamma-ray bursts
- Dynamics of Mesoscale Magnetic Field in Diffusive Shock Acceleration
- Linewidth Differences of Neutrals and Ions Induced by MHD Turbulence
- Turbulence-induced magnetic fields in shock precursors
- Evolution of High-Energy Particle Distribution in Mature Shell-Type Supernova Remnants
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- On the formation of density filaments in the turbulent interstellar medium
- Particle acceleration in the superwinds of starburst galaxies
- High-Energy Emission from Interacting Supernovae: New Constraints on Cosmic-Ray Acceleration in Dense Circumstellar Environments
- Superdiffusion of Cosmic Rays in Compressible Magnetized Turbulence
- Magnetogenesis around the first galaxies: the impact of different field seeding processes on galaxy formation
- Magnetic Imprisonment of Dusty Pinballs by a Supernova Remnant
- Turbulent Magnetic Field Amplification by the Interaction of Shock Wave and Inhomogeneous Medium
- Turbulence in a self-gravitating molecular cloud core
- Turbulence and Energetic Particles in Radiative Shock Waves in the Cygnus Loop I: Shock Properties
- Nonlinear turbulent dynamo during gravitational collapse
- Cosmic ray streaming in the turbulent interstellar medium
- Particle acceleration and magnetic field amplification in massive young stellar object jets
- Shock acceleration with oblique and turbulent magnetic fields
- Turbulent reconnection acceleration
- Discovery of Kolmogorov-like Magnetic Energy Spectrum in Tycho's Supernova Remnant by Two-point Correlations of Synchrotron Intensity
- Turbulent dynamo in a weakly ionized medium
- Synchrotron Polarization Radiative Transfer: Relativistic Thermal Electrons Contribution
- Lagrangian statistics of a shock-driven turbulent dynamo in decaying turbulence
- Quasi-perpendicular shock acceleration and TDE radio flares
- Radial Profiles of Non-thermal Emission from Supernova Remnant RX J1713.7-3946
- X-ray polarization in SN 1006 southwest shows spatial variations and differences with the radio band
- On the Potential of Faraday Tomography to Identify Shock Structures in Supernova Remnants
- A closer look at supernovae as seeds for galactic magnetization
- Can superbubbles accelerate ultra-high energy protons?
- TeV-PeV Gamma-ray and Neutrino Emission in the Galactic Plane
- Time-dependent treatment of cosmic-ray spectral steepening due to turbulence driving