[opcon]

The jets shown in the article come from the accretion disk [1], a disk of matter orbiting the black hole, formed as matter 'spirals' in.

For reasons we aren't 100% sure about yet (though we suspect it is due to angular momentum and energy transfer through some process [3]), matter (in the form of hot plasma) from this accretion disk can be launched out along the axis of rotation at relativistic speeds (close to the speed of light) in the form of astrophysical jets [2], which we can observe to due the radiation they emit. These jets play a large part in galaxy evolution, and as shown in the article can be huge, extending far beyond the galaxy itself.

1: https://en.wikipedia.org/wiki/Accretion_disk 2: https://en.wikipedia.org/wiki/Astrophysical_jet 3: https://link.springer.com/article/10.1007/s10509-009-9984-y