In a black hole driven jet, neutrinos of the type seen in IceCube can only be created in the collision between pairs of protons.
, there are a couple of options. The first is that there could be two black holes at the center of the galaxy, each emitting a jet, and the protons of the two jets collided.
A third option is that a proton in a jet collided with a stray hydrogen molecule some distance away from the black hole. This would also create a neutrino.
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