Efficient cosmic ray acceleration, hydrodynamics, and Self-consistent Thermal X-ray Emission applied to SNR RX J1713.7-3946 - Astrophysics > High Energy Astrophysical PhenomenaReportar como inadecuado




Efficient cosmic ray acceleration, hydrodynamics, and Self-consistent Thermal X-ray Emission applied to SNR RX J1713.7-3946 - Astrophysics > High Energy Astrophysical Phenomena - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We model the broad-band emission from SNR RX J1713.7-3946 including, for thefirst time, a consistent calculation of thermal X-ray emission together withnon-thermal emission in a nonlinear diffusive shock acceleration DSA model.Our model tracks the evolution of the SNR including the plasma ionization statebetween the forward shock and the contact discontinuity. We use a plasmaemissivity code to predict the thermal X-ray emission spectrum assuming theinitially cold electrons are heated either by Coulomb collisions with the shockheated protons the slowest possible heating, or come into instantequilibration with the protons. For either electron heating model, electronsreach >10^7 K rapidly and the X-ray line emission near 1 keV is more than 10times as luminous as the underlying thermal bremsstrahlung continuum. Sincerecent Suzaku observations show no detectable line emission, this places strongconstraints on the unshocked ambient medium density and on the relativisticelectron to proton ratio. For the uniform circumstellar medium CSM models weconsider, the low densities and high relativistic electron to proton ratiosrequired to match the Suzaku X-ray observations definitively rule outpion-decay as the emission process producing GeV-TeV photons. We show thatleptonic models, where inverse-Compton scattering against the cosmic backgroundradiation dominates the GeV-TeV emission, produce better fits to the broad-bandthermal and non-thermal observations in a uniform CSM.



Autor: Donald C. Ellison, Daniel J. Patnaude, Patrick Slane, John Raymond

Fuente: https://arxiv.org/







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