Centaur

Centaurs are misshapen, mutated creatures. They are a by-product of the Forced Evolutionary Virus, as they were created by tossing a varied mix of dogs, cats, brahmin and other animals into a FEV vat and seeing what came out the other end.

The Centaur are not only created by the FEV, they also seem to live in an heavy radiated environment. Therefore they radiate everything around them.