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.
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