Ionization cone
Ionization 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.[1][2]
There is not yet a scientific consensus on the mechanics of such cones.
References
This article is issued from Wikipedia - version of the Tuesday, December 03, 2013. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.