Spectral signatures of the MeV-PeV radiation from accreting neutron stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Gamma Ray Bursts, Neutrinos, Neutron Stars, Stellar Mass Accretion, X Ray Binaries, Protons, Stellar Magnetic Fields, Stellar Magnetospheres, Stellar Spectra, X Ray Spectra

Scientific paper

The formation of the high-energy gamma-ray and neutrino spectrum produced by the injection of a power-law proton distribution extending up to Ep = 10 exp 16 eV in the magnetosphere of accreting neutron stars is discussed. The resulting proton spectrum is calculated in the presence of advection and cooling by interactions with the X-ray spectrum of the neutron star, leading to several components of a secondary photon spectrum extending from the MeV to the PeV range, and neutrino spectrum extending from about 0.1 TeV to 0.1 PeV. The shapes of the resulting high-energy secondary spectra depend sensitively on the accreting source's X-ray spectrum and energy density as well as the magnetic field strength involved. Detailed spectra are calculated for the specific examples of Her X-1 and Cyg X-3.

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