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Thermal X-ray Emission and Cosmic Ray Production in Young Supernova Remnants

A. Decourchelle·D. C. Ellison·J. Ballet
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Abstract

We have developed a simple model to investigate the modifications of the hydrodynamics and non-equilibrium ionization X-ray emission in young supernova remnants due to nonlinear particle acceleration. In nonlinear, diffusive shock acceleration, the heating of the gas to X-ray emitting temperatures is strongly coupled to the acceleration of cosmic ray ions. If the acceleration is efficient and a significant fraction of the shock ram energy ends up in cosmic rays, compression ratios will be higher and the shocked temperature lower than test-particle, Rankine-Hugoniot relations predict. We illustrate how particle acceleration impacts the interpretation of X-ray data using the X-ray spectra of Kepler's remnant, observed by ASCA and RXTE. The thermal X-ray emission provides important constraints on the efficiency of particle acceleration, in complement to nonthermal emission. X-ray data from Chandra and XMM Newton, plus radio observations, will be essential to quantify nonlinear effects.

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A. Decourchelle, D. C. Ellison, J. Ballet. 2000-10-03. Thermal X-ray Emission and Cosmic Ray Production in Young Supernova Remnants. https://doi.org/10.1086/318167

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