On cosmic-ray production efficiency at supernova remnant shocks propagating into realistic diffuse interstellar medium

Abstract

Using three-dimensional magnetohydrodynamics simulations, we show that the efficiency of cosmic-ray (CR) production at supernova remnants (SNRs) is over-predicted if it could be estimated based on proper motion measurements of H$\alpha$ filaments in combination with shock-jump conditions. Density fluctuations of upstream medium make shock waves rippled and oblique almost everywhere. The kinetic energy of the shock wave is transferred into that of downstream turbulence as well as thermal energy which is related to the shock velocity component normal to the shock surface. Our synthetic observation shows that the CR acceleration efficiency as estimated from a lower downstream plasma temperature, is overestimated by 10-40%, because rippled shock does not immediately dissipate all upstream kinetic energy.

arXiv comment7 pages, 3 figures, 1 table, accepted for publication in ApJ; the paper with full resolution images is http://www.phys.aoyama.ac.jp/~ryo/papers/shimoda2015.pdf

References in corpus (40)

• On the magnetic fields and particle acceleration in Cas A
• Galactic and extragalactic magnetic fields
• 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
• Toward Understanding the Cosmic-ray Acceleration at Young Supernova Remnants Interacting with Interstellar Clouds: Possible Applications to RX J1713.7-3946
• Turbulence and Magnetic Field Amplification in Supernova Remnants: Interactions Between A Strong Shock Wave and Multi-Phase Interstellar Medium
• Measuring the cosmic ray acceleration efficiency of a supernova remnant
• Electron Heating and Cosmic Rays at a Supernova Shock from Chandra X-ray Observations of E0102.2-7219
• The X-ray synchrotron emission of RCW 86 and the implications for its age
• The Generation and Dissipation of Interstellar Turbulence - Results from Large Scale High Resolution Simulations
• Spatial Structure and Collisionless Electron Heating in Balmer-dominated Shocks
• Chandra Observations of A Galactic Supernova Remnant Vela Jr.: A New Sample of Thin Filaments Emitting Synchrotron X-Rays
• A Detailed Study of Molecular Clouds toward the TeV Gamma-Ray SNR G347.3-0.5
• A High-Resolution X-Ray and Optical Study of SN 1006: Asymmetric Expansion and Small-Scale Structure in a Type Ia Supernova Remnant
• Collisionless shocks in a partially ionized medium: I. Neutral return flux and its effects on acceleration of test particles
• Magnetic Field Amplification Associated with the Richtmyer-Meshkov Instability
• Evidence for nonlinear diffusive shock acceleration of cosmic-rays in the 2006 outburst of the recurrent nova RS Ophiuchi
• Origin of Radially Aligned Magnetic Fields in Young Supernova Remnants
• Balmer-Dominated Shocks Revisited
• Proper Motions of H-alpha filaments in the Supernova Remnant RCW 86
• Plasma instabilities as a result of charge exchange in the downstream region of supernova remnant shocks
• The pre-shock gas of SN1006 from HST/ACS observations
• The Heating of Thermal Electrons in Fast Collisionless Shocks: The Integral Role of Cosmic Rays
• Non-thermal X-rays and interstellar gas toward the γ-ray supernova remnant RX J1713.7-3946: Evidence for X-ray enhancement around CO and HI clumps
• The relation between post-shock temperature, cosmic-ray pressure and cosmic-ray escape for non-relativistic shocks
• Constraints On the Diffusive Shock Acceleration From the Nonthermal X-ray Thin Shells In SN1006 NE Rim
• Cosmic-Ray Acceleration Efficiency vs Temperature Equilibration: the Case of SNR 0509-67.5
• Shock Speed, Cosmic Ray Pressure, and Gas Temperature in the Cygnus Loop
• Oblique Ion Two-Stream Instability in the Foot Region of a Collisionless Shock
• Absence of Electron Surfing Acceleration in a Two-Dimensional Simulation
• Two-Step Acceleration Model of Cosmic Rays at Middle-Aged SNR
• Shock-cloud interaction and particle acceleration in SN 1006
• Effects of Leakage Neutral Particles on Shocks
• Effects of Neutral Particles on Modified Shocks at Supernova Remnants
• Suzaku Observation of the RCW86 Northeastern Shell
• Origin of the dust emission from Tycho's SNR
• Simulations of Collisionless Perpendicular Shocks in Partially Ionized Plasmas
• Cosmic Ray acceleration and Balmer emission from SNR 0509-67.5
• Cosmic Ray acceleration and Balmer emission from RCW 86 (G315.4-2.3)
• Acoustic instability in the neutral precursor region of collisionless shocks propagating into partially ionized plasmas

Cited by in corpus (11)

• The Highly Collimated Radio Jet of HH 80-81: Structure and Non-Thermal Emission
• Second Epoch Hubble Space Telescope Observations of Kepler's Supernova Remnant: The Proper Motions of Balmer Filaments
• Electron-Ion Temperature Ratio in Astrophysical Shocks
• The Refined Shock Velocity of the X-Ray Filaments in the RCW 86 Northeast Rim
• Discovery of Kolmogorov-like Magnetic Energy Spectrum in Tycho's Supernova Remnant by Two-point Correlations of Synchrotron Intensity
• A Systematic Study of the Thermal and Nonthermal Emission in the Supernova Remnant RCW 86 with Suzaku
• X-ray Line Diagnostics of Ion Temperature at Cosmic-Ray Accelerating Collisionless Shocks
• Polarized Balmer Line Emission from Supernova Remnant Shock Waves Efficiently Accelerating Cosmic Rays
• Cosmic-ray production from neutron escape in microquasar jets
• Radiative transfer of hydrogen lines from supernova remnant shock waves: contributions of 2s-state hydrogen atoms
• Measurement of the Forward Shock Velocities of the Supernova Remnant N132D Based on the Thermal X-ray Emission