Gamma-ray spectrum of RX J1713.7-3946 in the Fermi era and future detection of neutrinos

Details Gamma-ray spectrum of RX J1713.7-3946 in the Fermi era and future detection of neutrinos Gamma-ray spectrum of RX J1713.7-3946 in the Fermi era and future detection of neutrinos

2008-06-20

arxiv.org/abs/0806.3303v2

Astron.Astrophys. 495 (2009) 9-13

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, A&A in press

Scientific paper

10.1051/0004-6361:200810845

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 gamma-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 gamma-ray spectrum of Galactic young SNRs like RX J1713.7-3946. On the other hand, future km^3-class neutrino observations will likely find a clear evidence of the proton acceleration there.

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