H E ] 2 0 M ay 2 01 5 A Common Solution of Two Cosmic Puzzles

The origin of the high energy gamma-ray background, which was measured with the large area telescope (LAT) aboard the Fermi satellite at energy below 820 GeV, and of the diffuse cosmic background of neutrinos, which was observed at much higher energies with the IceCube detector deep under the south pole ice, are among the current unsolved major cosmic puzzles. Here we show that their properties indicate a common origin: the decay of mesons produced in collisions of cosmic rays accelerated in relativistic jets with matter inside these jets. Moreover, their properties are those expected if the the highly relativistic jets are those emitted mainly in core collapse supernovae of type Ic, and by Active Galactic nuclei.