Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.4508d&link_type=abstract
American Astronomical Society, HEAD meeting #12, #45.08
Astronomy and Astrophysics
Astronomy
Scientific paper
Gamma-ray spectra of Supernova Remnants (SNRs) in the TeV range tend to be softer than the prediction from Diffusive Shock Acceleration (DSA) models, whereas the theory of non-linear DSA predicts a much harder spectrum. We explore alternative ways to explain the observations by means of test-particle DSA. We start with spherically symmetric simulations of the SNR, and consider the acceleration of particles at both forward and reverse shocks, as well as the effect of different magnetic field profiles in the shocked interaction region. We study the temporal evolution of the non-thermal particle distribution, and synthesize surface brightness maps for various radiation mechanisms. Our studies show that taking the reverse shock into account modifies the spatial distribution of particles, and noticeably affects the volume integrated particle spectra. The spectra and emission morphology, and their time evolution, differ from single-shock solutions. In some cases, the soft high-energy gamma-ray spectra obtained are consistent with current TeV observations.
Dwarkadas Vikram
Pohl Mario
Telezhinsky Igor
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