a) the collapse of a very massive star
b) a large burst of star formation
c) material falling onto a supermassive black hole
d) radioactive decay in the galactic core
e) matter interacting with the galaxy’s magnetic field
It is C.
quasars are believed to now be the accretion disk and the escaping gas right before it is pulled over the event horizion into a super massive black hole.
on: 7th July 07