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Gamma-ray spectrum of RX J1713.7-3946 in the

By R. Yamazaki, K. Kohri and H. Katagiri


The recently launched satellite, Fermi Gamma-ray Space Telescope , is expected to find out if cosmic-ray (CR) protons are generated from supernova remnants (SNRs), especially RX J1713.7-3946, by observing the GeV-to-TeV γ-rays. The GeV emission is thought to be bright if the TeV emission is hadronic, i.e., of proton origin, while dim if leptonic.
We reexamine the above view using a simple theoretical model of nonlinear acceleration of particles to calculate the gamma-ray spectrum of Galactic young SNRs.
 If the nonlinear effects of CR acceleration are considered, it may be impossible to distinguish the evidence of proton acceleration from leptonic in the γ-ray spectrum of Galactic young SNRs like RX J1713.7-3946. On the other hand, future km3-class neutrino observations will likely find a clear evidence of the proton acceleration there.

Topics: acceleration of particles, ISM: supernova remnants, gamma rays: theory
Publisher: EDP Sciences
DOI identifier: 10.1051/0004-6361:200810845
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