Ionization cone
Encyclopedia
Ionisation cones are cones of material extending out from spiral galaxies
. They are visible because of their emissions which are believed to be from re-emission of photons produced by nuclear activity within the galaxy itself.
There is not yet a scientific consensus on the mechanics of such cones.
Spiral galaxy
A spiral galaxy is a certain kind of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, forms part of the Hubble sequence. Spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as...
. They are visible because of their emissions which are believed to be from re-emission of photons produced by nuclear activity within the galaxy itself.
There is not yet a scientific consensus on the mechanics of such cones.