Plasma instabilities as a result of charge exchange in the downstream region of supernova remnant shocks

Abstract

H-alpha emission from supernova remnants (SNRs) implies the existence of neutral hydrogen in the circumstellar medium. Some of the neutral particles penetrating the shock are ionized by the charge exchange process and make a cold ion beam in the shock downstream region. We perform linear analyses of collisionless plasma instabilities between the cold beam and the hot downstream plasma. We find that, under typical SNR conditions, either the resonant instability or the Weibel instability is the most unstable. This mechanism may amplify the magnetic field to more than 100 micro G and changes the shock structure. As a result, the radio spectrum and the large magnetic field can be explained, apart from the widely discussed Bell's mechanism.

10 pages, 1 figures, accepted for publication in ApJL

References in corpus (10)

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• Escape-limited Model of Cosmic-ray Acceleration Revisited
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• Possible Charge-Exchange X-Ray Emission in the Cygnus Loop Detected with Suzaku
• Escape of cosmic-ray electrons from supernova remnants
• On cosmic-ray production efficiency at supernova remnant shocks propagating into realistic diffuse interstellar medium
• Magnetic fields in cosmic particle acceleration sources
• Effects of Neutral Particles on Modified Shocks at Supernova Remnants
• Effects of Leakage Neutral Particles on Shocks
• Injection to rapid diffusive shock acceleration at perpendicular shocks in partially ionized plasmas
• Magnetic field amplification by collisionless shocks in partially ionized plasmas
• Collisionless shocks in partly ionized plasma with cosmic rays: microphysics of non-thermal components
• Simulations of Collisionless Perpendicular Shocks in Partially Ionized Plasmas
• Prospects for CTA observations of the young SNR RX J1713.7-3946
• Spectral softening in core-collapse supernova remnant expanding inside wind-blown bubble
• High Forbidden-to-resonance Line Ratio of OVII Discovered in the Cygnus Loop
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• The Biermann battery driven by a streaming plasma
• Fast Particle Acceleration at Perpendicular Shocks with Uniform Upstream Magnetic Field and Strong Downstream Turbulence
• Magnetic field generation by an inhomogeneous return current
• Interaction of a Relativistic Magnetized Collisionless Shock with a Dense Clump
• Magnetic field generation by charge exchange in a supernova remnant in the early universe