Active Galactic Nucleus. The core of an active galaxy responsible for the enormous luminosity. Many contains massive black holes.
Cerenkov Light:
Light emitted by a medium when traversed by a charged subatomic particle moving with a velocity greater than the speed of light in that medium. The light is emitted in the direction of motion of the inducing particle.Extensive Air Shower
A cascade of subatomic particles in the earth's atmosphere, initiated when an energetic cosmic ray collides with an atmospheric atom or molecule.Flourescent Light
Light emitted through the excitation and ionization of atoms and molecule by high-speed charged subatomic particles. This light is emitted in all directions,unlike the beamed Cerenkov light.Ionization
The process by which an tom loses electrons. May occur when a charged high-speed subatomic particle passes through a collection of atoms.The air fluorescence yield
is defined as the number of photons produced by a charged particle
per meter of travel.
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