Whoooh Nellie!

The apparent excess is at an energy level, not a place? And the reason it has to be galactic is because we have a theory that says they can't get here from there?

That was the running hypothesis for decades, before it was more-or-less proven 'broad spectrum' CR's were not aligned with the galactic plain and therefore truly cosmic.

Now we have imaginary particles colliding in ways that release energy in ways that we cannot duplicate. These imaginary particles also require properties we cannot, or have not been able to study in the laboratory. This is not a "Mysterious Source of High-Energy Cosmic Radiation Discovered" but another rather untestable hypothesis.

The evidence is cool, the imagination of Dark Matter theories resourceful; but the science backing this claim is at best, weak. I have a LOT of trouble with extensions of theories that fail to meet expectations in many ways (such as the many futile searches for gravitational waves) parking power rays right at our own doorstep: When astronauts leave the protective confines of our own atmosphere, their brains are riddled with cosmic zapping. If this is Dark Matter colliding with Dark Matter, shouldn't we detect occasional extremely high energy events in our massive, sensitive neutrino detectors? Did I just lose another brain cell?

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jwj

It's a big universe out there...is it really unwinding, really burning out?