High-energy neutrino emission from binary X-ray sources

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Rays, Gamma Ray Astronomy, High Energy Interactions, Neutrinos, Particle Production, X Ray Binaries, Energetic Particles, Energy Spectra, Particle Acceleration, Pulsars

Scientific paper

Recently gamma rays up to 10 PeV were observed from Cyg X3, Vela X1, and LMC X4. This is a strong indication that protons (or nuclei) are accelerated in the vicinity of the accreting pulsar. The production of high-energy neutrinos associated with the gamma-ray production is discussed. It is shown that, on the basis of observational parameters of the three binary systems, the time average of the ratio of the neutrino luminosity to the gamma-ray luminosity is about 30. The neutrino flux is modulated with the orbital period of the system, and the neutrino light curve is determined by the density profile of the companion star. In general some of the X-ray binaries can be both UHE gamma-ray and neutrino emitters with a neutrino luminosity comparable to their X-ray luminosity. The brightest of these could be detected by future neutrino telescopes such as DUMAND and MACRO at Gran Sasso.

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