Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-31
J.Phys.Conf.Ser.39:408-415,2006
Astronomy and Astrophysics
Astrophysics
To be published in Proceedings of TAUP 2005: The 9th International Conference on Topics in Astroparticle Physics and Undergrou
Scientific paper
10.1088/1742-6596/39/1/106
The recent detection of TeV gamma-rays from the microquasar LS 5039 by HESS is one of the most exciting discoveries of observational gamma-ray astronomy in the very high energy regime. This result clearly demonstrates that X-ray binaries with relativistic jets (microquasars) are sites of effective acceleration of particles (electrons and/or protons) to multi-TeV energies. Whether the gamma-rays are of hadronic or leptonic origin is a key issue related to the origin of Galactic Cosmic Rays. We discuss different possible scenarios for the production of gamma-rays, and argue in favor of hadronic origin of TeV photons, especially if they are produced within the binary system. If so, the detected gamma-rays should be accompanied by a flux of high energy neutrinos emerging from the decays of \pi^\pm mesons produced at pp and/or p \gamma interactions. The flux of TeV neutrinos, which can be estimated on the basis of the detected TeV gamma-ray flux, taking into account the internal \gamma \gamma \to e^+e^- absorption, depends significantly on the location of gamma-ray production region(s). The minimum neutrino flux above 1 TeV is expected to be at the level of 10^{-12} cm^{-2} s^{-1}; however, it could be up to a factor of 100 larger. The detectability of the signal of multi-TeV neutrinos significantly depends on the high energy cutoff in the spectrum of parent protons; if the spectrum of accelerated protons continues to 1 PeV and beyond, the predicted neutrino fluxes can be probed by the planned km^3-scale neutrino detector.
Aharonian Felix A.
Anchordoqui Luis A.
Khangulyan Dmitry
Montaruli Teresa
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