Armen Atoyan, Charles Dermer
Recent Fermi and VERITAS observations of the prototypical Type Ia supernova
remnant (SNR) Tycho have discovered gamma-rays with energies E in the range
from ~0.4 GeV to 10 TeV. Crucial for the theory of Galactic cosmic-ray origin
is whether the gamma-rays from SNRs are produced by accelerated hadrons
(protons and ions), or by relativistic electrons. Here we show that the
broadband radiation spectrum of Tycho can be explained within the framework of
a two-zone leptonic model, which is likely to apply to every SNR. A model with
hadrons can also fit the radiation spectrum. The hadronic origin of gamma-rays
can be confirmed by Fermi spectral measurements of Tycho and other SNRs at
energies below ~300 MeV.
View original:
http://arxiv.org/abs/1111.4175
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