Particle acceleration controlled by ambient density in the southwestern rim of RCW 86

Abstract

Particle acceleration physics at supernova remnant (SNR) shocks is one of the most intriguing problems in astrophysics. SNR RCW~86 provides a suitable environment for understanding the particle acceleration physics because one can extract the information of both accelerated particles and acceleration environment at the same regions through the bright X-ray emission. In this work, we study X-ray proper motions and spectral properties of the southwestern region of RCW~86. The proper motion velocities are found to be $\sim 300$--2000~km~s${}^{-1}$ at a distance of 2.8~kpc. We find two inward-moving filaments, which are more likely reflected shocks rather than reverse shocks. Based on the X-ray spectroscopy, we evaluate thermal parameters such as the ambient density and temperature, and non-thermal parameters such as the power-law flux and index. From the flux decrease in time of several non-thermal filaments, we estimate the magnetic field amplitudes to be $\sim 30$--100~$\mu$G. Gathering the physical parameters, we then investigate parameter correlations. We find that the synchrotron emission from thermal-dominated filaments is correlated with the ambient density $n_{\mathrm{e}}$ as $\text{(power-law flux)}\propto n_{\mathrm{e}}^{1.0\pm 0.2}$ and $\text{(power-law index)}\propto n_{\mathrm{e}}^{0.38\pm 0.10}$, not or only weakly with the shock velocity and shock obliquity. As an interpretation, we propose a shock-cloud interaction scenario, where locally enhanced magnetic turbulence levels have a great influence on local acceleration conditions.

arXiv comment20 pages, 20 figures, accepted for publication in ApJ

References in corpus (37)

• HI4PI: A full-sky HI survey based on EBHIS and GASS
• 9286 Stars: An Agglomeration of Stellar Polarization Catalogs
• Absolute measurement of the unresolved cosmic X-ray background in the 0.5-8 keV band with Chandra
• Magnetic Field Amplification in Tycho and other Shell-type Supernova Remnants
• Study of the X-Ray Background Spectrum and its Large-Scale Fluctuation with ASCA
• 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
• Analytical solutions for energy spectra of electrons accelerated by nonrelativistic shock-waves in shell type supernova remnants
• Observational signatures of particle acceleration in supernova remnants
• Energy Spectra of the Soft X-ray Diffuse Emission in Fourteen Fields Observed with Suzaku
• Non linear particle acceleration at non-relativistic shock waves in the presence of self-generated turbulence
• The X-ray synchrotron emission of RCW 86 and the implications for its age
• RCW 86: A Type Ia Supernova in a Wind-Blown Bubble
• X-Ray Synchrotron Emitting Fe-Rich Ejecta in SNR RCW 86
• Evolution of high-energy particle distribution in Supernova Remnants
• Discovery of Non-Thermal X-Rays from the Shell of RCW86
• X-ray Measurements of the Particle Acceleration Properties at Inward Shocks in Cassiopeia A
• Turbulent amplification of magnetic field driven by dynamo effect at rippled shocks
• 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
• A detailed study of non-thermal X-ray properties and interstellar gas toward the γ-ray supernova remnant RX J1713.7-3946
• Steady X-Ray Synchrotron Emission in the Northeastern Limb of SN 1006
• Magnetic-Field Amplification in the Thin X-ray Rims of SN1006
• Suzaku View of the Supernova Remnant RCW 86: X-Ray Studies of Newly-Discovered Fe-Rich Ejecta
• Fermi Large Area Telescope Detection of Supernova Remnant RCW 86
• The Radio Structure of the Supernova Remnant MSH14-63
• Systematic Study of Acceleration Efficiency in Young Supernova Remnants with Nonthermal X-ray Observations
• Energy Dependence of Synchrotron X-Ray Rims in Tycho's Supernova Remnant
• The Refined Shock Velocity of the X-Ray Filaments in the RCW 86 Northeast Rim
• Possible Evidence for Cosmic-Ray Acceleration in the Type Ia SNR RCW 86: Spatial Correlation between TeV Gamma rays and Interstellar Atomic Protons
• Spatial and Temporal Variations of the Chandra ACIS Particle-Induced Background and Development of a Spectral-Model Generation Tool
• NuSTAR observations of the supernova remnant RX J1713.7$-$3946
• Synchrotron X-ray diagnostics of cutoff shape of nonthermal electron spectrum at young supernova remnants
• Observational constraints on the maximum energies of accelerated particles in supernova remnants: low maximum energies and a large variety
• Nonthermal emission properties of the northwestern rim of supernova remnant RX J0852-4622
• Vortical amplification of magnetic field at inward shock of supernova remnant Cassiopeia A
• Study on the escape timescale of high-energy particles from supernova remnants through thermal X-ray properties
• A Systematic Study of the Thermal and Nonthermal Emission in the Supernova Remnant RCW 86 with Suzaku

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• Kinematics of Supernova Remnants Using Multiepoch Maximum Likelihood Estimation: Chandra Observation of Cassiopeia A as an Example
• A new wideband radio polarization observation of the Supernova Remnant G315.4$-$2.3
• Magnetic-field Order in the Southwestern Rim of RCW 86 Constrained Using X-Ray Polarimetry