A pulsar wind nebula (PWN, plural PWNe), sometimes called a plerion (derived from the Greek "πλήρης", pleres, meaning "full"),[1] is a type of nebula sometimes found inside the shell of a supernova remnant (SNR), powered by winds generated by a central pulsar. These nebulae were proposed as a class in 1976 as enhancements at radio wavelengths inside supernova remnants.[1] They have since been found to be infrared, optical, millimetre, X-ray[2] and gamma ray sources.[3][4]
Gaensler2006
was invoked but never defined (see the help page).