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Title: The Interplay of Magnetically Dominated Turbulence and Magnetic Reconnection in Producing Nonthermal Particles

Journal Article · · The Astrophysical Journal (Online)

Magnetized turbulence and magnetic reconnection are often invoked to explain the nonthermal emission observed from a wide variety of astrophysical sources. By means of fully kinetic 2D and 3D particle-in-cell simulations, we investigate the interplay between turbulence and reconnection in generating nonthermal particles in magnetically dominated (or, equivalently, “relativistic”) pair plasmas. A generic by-product of the turbulence evolution is the generation of a nonthermal particle spectrum with a power-law energy range. The power-law slope p is harder for larger magnetizations and stronger turbulence fluctuations, and it can be as hard as p ≲ 2. The Larmor radius of particles at the high-energy cutoff is comparable to the size l of the largest turbulent eddies. Plasmoid-mediated reconnection, which self-consistently occurs in the turbulent plasma, controls the physics of particle injection. Then, particles are further accelerated by stochastic scattering off turbulent fluctuations. The work done by parallel electric fields—naturally expected in reconnection layers—is responsible for most of the initial energy increase and is proportional to the magnetization σ of the system, while the subsequent energy gain, which dominates the overall energization of high-energy particles, is powered by the perpendicular electric fields of turbulent fluctuations. The two-stage acceleration process leaves an imprint in the particle pitch-angle distribution: lowenergy particles are aligned with the field, while the highest-energy particles move preferentially orthogonal to it. The energy diffusion coefficient of stochastic acceleration scales as Dγ ~ 0.1σ(c/l)γ2, where γ is the particle Lorentz factor. This results in fast cceleration timescales tacc ~ (3/σ)l/c. Our findings have important implications for understanding the generation of nonthermal particles in high-energy astrophysical sources.

Research Organization:
Columbia Univ., New York, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0016542
OSTI ID:
1803038
Journal Information:
The Astrophysical Journal (Online), Vol. 886, Issue 2; ISSN 1538-4357
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (167)

Astrophysical magnetic fields and nonlinear dynamo theory text January 2004
Fast magnetic reconnection in the plasmoid-dominated regime text January 2010
Fractional Transport in Strongly Turbulent Plasmas text January 2017
General theory of the plasmoid instability journal October 2016
STUDY OF THE SPECTRAL AND TEMPORAL CHARACTERISTICS OF X-RAY EMISSION OF THE GAMMA-RAY BINARY LS 5039 WITH SUZAKU journal May 2009
Thermal-inertial effects on magnetic reconnection in relativistic pair plasmas text January 2014
Self-consistent Coronal Heating and Solar Wind Acceleration from Anisotropic Magnetohydrodynamic Turbulence text January 2007
Theory of extragalactic radio sources journal April 1984
Fast reconnection in high-Lundquist-number plasmas due to the plasmoid Instability journal November 2009
Coherent structure formation and magnetic field line reconnection in magnetohydrodynamic turbulence journal August 1990
Scaling of Magnetic Reconnection in Relativistic Collisionless Pair Plasmas journal March 2015
Magnetic Reconnection as a Driver for a Sub-ion-scale Cascade in Plasma Turbulence journal November 2017
Dissipation in Turbulent Plasma due to Reconnection in Thin Current Sheets journal July 2007
Particle Acceleration in Turbulence and Weakly Stochastic Reconnection journal June 2012
Plasmoid Instability in Evolving Current Sheets and Onset of Fast Reconnection journal November 2017
GRB 080319B: evidence for relativistic turbulence, not internal shocks journal May 2009
Supernovae and Supernova Remnants journal September 1988
Acceleration of Relativistic Electrons by Magnetohydrodynamic Turbulence: Implications for Non-Thermal Emission from Black hole Accretion Disks journal July 2014
Local Kinetic Effects in Two-Dimensional Plasma Turbulence journal January 2012
Nonhelical Inverse Transfer of a Decaying Turbulent Magnetic Field journal February 2015
Inverse Cascade of Nonhelical Magnetic Turbulence in a Relativistic Fluid journal October 2014
Fast Magnetic Reconnection and Particle Acceleration in Relativistic Low-Density Electron-Positron Plasmas Without Guide Field journal April 2012
Collisionless kinetic theory of oblique tearing instabilities journal February 2018
Why does steady-state magnetic reconnection have a maximum local rate of order 0.1? text January 2016
Phase diagram for magnetic reconnection in heliophysical, astrophysical, and laboratory plasmas journal November 2011
The physics of gamma-ray bursts journal August 1991
Role of the Plasmoid Instability in Magnetohydrodynamic Turbulence journal October 2018
Relativistic Reconnection: an Efficient Source of Non-Thermal Particles journal February 2014
The surprising Crab pulsar and its nebula: a review text January 2014
Toward a theory of interstellar turbulence. 2: Strong alfvenic turbulence journal January 1995
Simulations of relativistic collisionless shocks: shock structure and particle acceleration conference January 2005
Formation of Hard Power Laws in the Energetic Particle Spectra Resulting from Relativistic Magnetic Reconnection journal October 2014
Electron-scale reduced fluid models with gyroviscous effects text January 2017
Phase Diagram for Magnetic Reconnection in Heliophysical, Astrophysical and Laboratory Plasmas text January 2011
Interpreting Crab Nebula’s synchrotron spectrum: two acceleration mechanisms journal August 2019
In situ evidence of magnetic reconnection in turbulent plasma journal March 2007
Fatty acids, fatty alcohols, wax esters, and methyl esters from Crambe abyssinica and Lunaria annua seed oils journal December 1963
Electron and ion energization in relativistic plasma turbulence text January 2018
Plasmoids in relativistic reconnection, from birth to adulthood: first they grow, then they go journal July 2016
Electron density power spectrum in the local interstellar medium journal April 1995
Magnetohydrodynamics in the extreme relativistic limit journal March 1998
Test Particle Energization by Current Sheets and Nonuniform Fields in Magnetohydrodynamic Turbulence journal December 2004
Compressible Magnetohydrodynamic Turbulence in Interstellar Plasmas journal November 2001
The inner jet of an active galactic nucleus as revealed by a radio-to-γ-ray outburst journal April 2008
Transition from collisional to kinetic regimes in large-scale reconnection layers journal August 2009
Magnetorotational Turbulence and Dynamo in a Collisionless Plasma journal December 2016
Beaming and Rapid Variability of High-Energy Radiation from Relativistic pair Plasma Reconnection journal July 2012
Evolving turbulence and magnetic fields in galaxy clusters journal March 2006
Particle Acceleration in Turbulence and Weakly Stochastic Reconnection text January 2012
Plasmoids in relativistic reconnection, from birth to adulthood: first they grow, then they go text January 2016
Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence journal November 2017
Test particle energization and the anisotropic effects of dynamical MHD turbulence text January 2017
Extended MHD turbulence and its applications to the solar wind text January 2016
Magnetorotational Turbulence and Dynamo in a Collisionless Plasma text January 2016
Current and vorticity dynamics in three‐dimensional magnetohydrodynamic turbulence journal August 1995
Three-dimensional magnetohydrodynamic simulations of the Crab nebula journal December 2013
Reconnection and small-scale fields in 2D-3V hybrid-kinetic driven turbulence simulations journal February 2017
Visco-resistive plasmoid instability journal March 2016
Self‐consistent Coronal Heating and Solar Wind Acceleration from Anisotropic Magnetohydrodynamic Turbulence
  • Cranmer, Steven R.; van Ballegooijen, Adriaan A.; Edgar, Richard J.
  • The Astrophysical Journal Supplement Series, Vol. 171, Issue 2 https://doi.org/10.1086/518001
journal August 2007
On the value of the reconnection rate journal November 2016
Magnetic reconnection and m = 1 oscillations in current carrying plasmas journal June 1978
Why does Steady-State Magnetic Reconnection have a Maximum Local Rate of Order 0.1? journal February 2017
Cosmic Ray Streaming--I EFFECT OF ALFVEN WAVES ON PARTICLES journal September 1975
Imbalanced Relativistic Force-Free Magnetohydrodynamic Turbulence journal December 2013
Coronal Heating by Magnetohydrodynamic Turbulence Driven by Reflected Low-Frequency Waves journal September 1999
The Physics of Gamma-Ray Bursts text January 2004
Supernovae and Supernova, Remnants journal March 1968
Extended theory of the Taylor problem in the plasmoid-unstable regime journal April 2015
Stochastic Acceleration by Turbulence journal June 2012
The interplay of magnetically-dominated turbulence and magnetic reconnection in producing nonthermal particles dataset January 2019
Exploring the statistics of magnetic reconnection X-points in kinetic particle-in-cell turbulence journal October 2017
Influence of tearing instability on magnetohydrodynamic turbulence journal September 2018
Dynamics of decaying two‐dimensional magnetohydrodynamic turbulence journal October 1989
Particle acceleration in relativistic magnetic flux-merging events journal December 2017
Energetic particles in solar flares conference January 1979
Magnetohydrodynamic Turbulence in the Plasmoid-mediated Regime journal February 2018
Scaling laws of resistive magnetohydrodynamic reconnection in the high-Lundquist-number, plasmoid-unstable regime text January 2010
Astrophysical magnetic fields and nonlinear dynamo theory journal October 2005
Finite-Resistivity Instabilities of a Sheet Pinch journal January 1963
Magnetic Reconnection in Two-Dimensional Magnetohydrodynamic Turbulence journal March 2009
Kinetic Cascade in Solar-wind Turbulence: 3D3V Hybrid-kinetic Simulations with Electron Inertia journal September 2017
Three-Dimensional Magnetohydrodynamic Simulations of the Crab Nebula text January 2013
Cosmic-ray transport and acceleration. I - Derivation of the kinetic equation and application to cosmic rays in static cold media. II - Cosmic rays in moving cold media with application to diffusive shock wave acceleration journal January 1989
Plasmoid Instability in Forming Current Sheets journal November 2017
Fully kinetic simulations of undriven magnetic reconnection with open boundary conditions journal July 2006
Turbulence, Magnetic Reconnection in Turbulent Fluids and Energetic Particle Acceleration journal October 2012
Particle Acceleration in Relativistic Plasma Turbulence journal December 2018
Structure of the electromagnetic field in three-dimensional Hall magnetohydrodynamic turbulence journal April 2006
Simulations of Relativistic Force‐free Magnetohydrodynamic Turbulence journal March 2005
Stochastic particle acceleration in the lobes of giant radio galaxies journal November 2009
Turbulent Magnetohydrodynamic Reconnection Mediated by the Plasmoid Instability journal February 2016
Generation of X-points and secondary islands in 2D magnetohydrodynamic turbulence journal April 2013
Marginal Stability of Sweet–Parker Type Current Sheets at Low Lundquist Numbers journal May 2018
Spectrum of Magnetohydrodynamic Turbulence journal March 2006
Influence of 3D plasmoid dynamics on the transition from collisional to kinetic reconnection journal July 2019
Evolving turbulence and magnetic fields in galaxy clusters text January 2005
Nonlinear reconnecting edge localized modes in current-carrying plasmas journal May 2017
Fractional Transport in Strongly Turbulent Plasmas journal July 2017
Numerical Simulations of Driven Relativistic Magnetohydrodynamic Turbulence journal December 2011
Faraday Conversion in Turbulent Blazar Jets text January 2016
Relativistic magnetic reconnection in pair plasmas and its astrophysical applications text January 2014
System-size convergence of nonthermal particle acceleration in relativistic plasma turbulence text January 2018
Particle Energy Diffusion in Linear Magnetohydrodynamic Waves journal May 2019
A Bayesian view on Faraday rotation maps – Seeing the magnetic power spectra in galaxy clusters journal April 2005
Collisionless magnetic reconnection in large-scale electron-positron plasmas journal July 2007
Generalized Relativistic Magnetohydrodynamic Equations for pair and Electron-Ion Plasmas journal April 2009
Stochastic electron acceleration during spontaneous turbulent reconnection in a strong shock wave journal February 2015
Nonthermal Particle Acceleration in 3D Relativistic Magnetic Reconnection in Pair Plasma text January 2017
The relativistic quasilinear theory of particle acceleration by hydromagnetic turbulence journal August 1971
Relativistic Magnetic Reconnection in Pair Plasmas and Its Astrophysical Applications journal January 2015
System-size Convergence of Nonthermal Particle Acceleration in Relativistic Plasma Turbulence journal October 2018
Magnetohydrodynamic Turbulence Mediated by Reconnection journal July 2017
Instability, turbulence, and enhanced transport in accretion disks journal January 1998
Role of electron physics in the development of turbulent magnetic reconnection in collisionless plasmas journal April 2011
Magnetohydrodynamic Turbulence journal August 2003
General Theory of the Plasmoid Instability text January 2016
Electron-scale reduced fluid models with gyroviscous effects journal July 2017
The steady growth of the high-energy spectral cut-off in relativistic magnetic reconnection journal October 2018
Interpreting Crab Nebula synchrotron spectrum: two acceleration mechanisms text January 2018
Two-Fluid Magnetohydrodynamic Simulations of Relativistic Magnetic Reconnection journal April 2009
Magnetohydrodynamic Turbulence book August 2009
Fast Magnetic Reconnection in the Plasmoid-Dominated Regime journal December 2010
Stochastic Particle Acceleration in Turbulence Generated by Magnetorotational Instability journal May 2016
Electron and Ion Energization in Relativistic Plasma Turbulence journal February 2019
The Effect of Coherent Structures on Stochastic Acceleration in MHD Turbulence journal January 2006
Scaling laws of resistive magnetohydrodynamic reconnection in the high-Lundquist-number, plasmoid-unstable regime journal June 2010
Particle Acceleration in Multiple Dissipation Regions journal March 2004
Scattering of Energetic Particles by Anisotropic Magnetohydrodynamic Turbulence with a Goldreich-Sridhar Power Spectrum journal November 2000
Turbulent magnetic reconnection journal January 1986
First order particle acceleration in magnetically-driven flows text January 2014
On the Value of the Reconnection Rate text January 2016
Generalized Fermi Acceleration conference February 2020
Particle Acceleration and Plasma Dynamics During Magnetic Reconnection in the Magnetically Dominated Regime journal June 2015
Role of Magnetic Reconnection in Magnetohydrodynamic Turbulence journal June 2017
Test-Particle Acceleration in a Hierarchical Three-Dimensional Turbulence Model journal February 2014
Ion diffusion and acceleration in plasma turbulence journal November 2018
The Effect of Coherent Structures on Stochastic Acceleration in MHD Turbulence text January 2005
Thermal-Inertial Effects on Magnetic Reconnection in Relativistic Pair Plasmas journal July 2014
Generalized Fermi acceleration journal April 2019
Inertial-Range Spectrum of Hydromagnetic Turbulence journal January 1965
On two-dimensional magnetohydrodynamic turbulence journal July 2001
Marginal Stability of Sweet-Parker Type Current Sheets at Low Lundquist Numbers text January 2018
The surprising Crab pulsar and its nebula: a review journal June 2014
Acceleration and escape processes of high-energy particles in turbulence inside hot accretion flows journal February 2019
Kinetic Turbulence in Relativistic Plasma: From Thermal Bath to Nonthermal Continuum journal February 2017
Magnetohydrodynamic turbulence in supernova remnants journal February 2009
On a plasma sheath separating regions of oppositely directed magnetic field journal January 1962
Linear plasmoid instability of thin current sheets with shear flow journal May 2010
Nonthermal Particle Acceleration in 3D Relativistic Magnetic Reconnection in Pair Plasma journal July 2017
Particle acceleration at astrophysical shocks: A theory of cosmic ray origin journal October 1987
Three-Dimensional Simulations of Magnetohydrodynamic Turbulence Behind Relativistic Shock Waves and Their Implications for Gamma-Ray Bursts journal May 2011
Faraday Conversion in Turbulent Blazar Jets journal July 2018
The Extent of Power-Law Energy Spectra in Collisionless Relativistic Magnetic Reconnection in pair Plasmas journal December 2015
Particle Acceleration by Magnetohydrodynamic Turbulence conference January 2012
Collisionless m=1 tearing mode journal January 1991
First-Order Particle Acceleration in Magnetically Driven Flows journal March 2016
Extended mhd Turbulence and its Applications to the Solar wind journal September 2016
Particle Acceleration by Magnetohydrodynamic Turbulence journal February 2006
Magnetic fields in galaxies and beyond journal January 1997
Particle Acceleration in Multiple Dissipation Regions text January 2004
Test particle acceleration in turbulent reconnecting magnetic fields journal January 1988
Instability, Turbulence, and Enhanced Transport in Accretion Disks journal January 1997
Can Hall Magnetohydrodynamics Explain Plasma Turbulence at Sub-ion Scales? journal January 2019
The physics of gamma-ray bursts journal January 2005
Disruption of sheet-like structures in Alfvénic turbulence by magnetic reconnection journal March 2017
Statistics of magnetic reconnection in two-dimensional magnetohydrodynamic turbulence journal March 2010
Hot Accretion Flows Around Black Holes journal August 2014

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