Particle Spectra from Acceleration at Forward and Reverse Shocks of Young Type Ia Supernova Remnants

Details Particle Spectra from Acceleration at Forward and Reverse Shocks of Young Type Ia Supernova Remnants Particle Spectra from Acceleration at Forward and Reverse Shocks of Young Type Ia Supernova Remnants

2011-10-03

arxiv.org/abs/1110.0361v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Accepted in Astroparticle Physics

Scientific paper

We study cosmic-ray acceleration in young Type Ia Supernova Remnants (SNRs) by means of test-particle diffusive shock acceleration theory and 1-D hydrodynamical simulations of their evolution. In addition to acceleration at the forward shock, we explore the particle acceleration at the reverse shock in the presence of a possible substantial magnetic field, and consequently the impact of this acceleration on the particle spectra in the remnant. We investigate the time evolution of the spectra for various time-dependent profiles of the magnetic field in the shocked region of the remnant. We test a possible influence on particle spectra of the Alfv\'enic drift of scattering centers in the precursor regions of the shocks. In addition, we study the radiation spectra and morphology in a broad band from radio to gamma-rays. It is demonstrated that the reverse shock contribution to the cosmic-ray particle population of young Type Ia SNRs may be significant, modifying the spatial distribution of particles and noticeably affecting the volume-integrated particle spectra in young SNRs. In particular spectral structures may arise in test-particle calculations that are often discussed as signatures of non-linear cosmic-ray modification of shocks. Therefore, the spectrum and morphology of emission, and their time evolution, differ from pure forward-shock solutions.

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