The GeV emission zone in Cygnus X-3 is too large and magnetized too weakly to accelerate protons to PeV energies, so the PeV gamma rays must originate from a more compact inner region with rapid magnetic field dissipation.
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Fermi-LAT data show Vela Jr GeV emission matches the H.E.S.S. shell template with index 1.77, and a hybrid model statistically outperforms pure leptonic for the broadband SED.
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Constraining the PeV gamma-ray emission zone of Cygnus X-3 with contemporaneous GeV timing and spectral observations
The GeV emission zone in Cygnus X-3 is too large and magnetized too weakly to accelerate protons to PeV energies, so the PeV gamma rays must originate from a more compact inner region with rapid magnetic field dissipation.
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GeV gamma-ray emission in the field of the shell-type supernova remnant Vela Jr revisited
Fermi-LAT data show Vela Jr GeV emission matches the H.E.S.S. shell template with index 1.77, and a hybrid model statistically outperforms pure leptonic for the broadband SED.