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Particle spectra from acceleration at forward and reverse shocks of young Type Ia Supernova Remnants |
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| Authors: | I Telezhinsky VV DwarkadasM Pohl |
| Institution: | a DESY, Platanenallee 6, 15738 Zeuthen, Germany b University of Chicago, Department of Astronomy & Astrophysics, 5640 S Ellis Ave, AAC 010c, Chicago, IL 60637, USA c Universität Potsdam, Institut für Physik & Astronomie, Karl-Liebknecht-Strasse 24/25, 14476 Potsdam, Germany |
| Abstract: | 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 Alfvénic 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. |
| Keywords: | Supernova Remnants Cosmic rays Cosmic-ray acceleration Hydrodynamics Forward and reverse shocks |
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