Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-16
Phys.Rev.D74:063009,2006
Astronomy and Astrophysics
Astrophysics
10 pages, 16 figures, references added, matches published version
Scientific paper
10.1103/PhysRevD.74.063009
We calculate the yield of high energy neutrinos produced in astrophysical sources with negligible magnetic fields varying their interaction depth from nearly transparent to opaque. We take into account the scattering of secondaries on background photons as well as the direct production of neutrinos in decays of charm mesons. If multiple scattering of nucleons becomes important, the neutrino spectra from meson and muon decays are strongly modified with respect to transparent sources. Characteristic for neutrino sources containing photons as scattering targets is a strong energy-dependence of the ratio $R^0$ of $\nu_\mu$ and $\nu_e$ fluxes at the sources, ranging from $R^0=\phi_\mu/\phi_e\sim 0$ below threshold to $R^0\sim 4$ close to the energy where the decay length of charged pions and kaons equals their interaction length on target photons. Above this energy, the neutrino flux is strongly suppressed and depends mainly on charm production.
Kachelriess Michael
Tomas Ricard
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