Not only does the central engine of active galaxies and quasars require a black hole, but also to provide the radiative energy.
A) a high rate of rotation for the black hole
B) an accretion disk of infalling matter
C) a very strong magnetic field from neutron stars
D) globular clusters for food
E) a source of high- energy electrons for synchrotron radiation

Question

Quizplus · Accepted Answer

An accretion disk of infalling matter is necessary to provide the radiative energy in active galaxies and quasars, as the matter falling into the black hole releases energy in the form of radiation.

Not Only Does the Central Engine of Active Galaxies and Quasars