This question already has an answer here:
A black hole, neutron star or any object that has accumulated an accretion disc, sometimes features opposing jets, positioned perpendicular to the accretion disc.
I understand that these jets are produced by magnetic fields created by the enormous amount of electrically charged plasma located on the "equator" of the gravity source. Please correct me if I have this either plain wrong or under-simplified it.
My question is: where does the material, either electron-ion jets or electron-positron jets, come from?
If it comes from the accretion disc itself, is it made up of particles that have a slight velocity vector component inwards, normal to the gravity source, which then get caught up in the central magnetic field and forced into the outrunning jet?
Alternatively, is it matter that is preexisting around the poles of the gravity source. Assumption 1 seems far more likely to me, but I would appreciate any explanation.
EDIT: There are duplicate type questions listed below but 1. The answer to my question postulated the possible creation of material at the base of the disc, and 2. I wanted to know could the jets occur from existing material in the jet region? Neither of these points, in my opinion, were dealt with in the previous questions. END EDIT