The unification models propose that in Seyfert 1s the observer has a direct view of the active nucleus.

Its active nucleus is a strong source of radio waves.

But a new survey of active galactic nuclei suggests that this model may need some serious revision.

When people went looking for active galactic nuclei, they often found them in galaxies that were undergoing mergers.

This emission is actually quite common for active galactic nuclei.

But the question is, does this happen to every single jet or active nucleus, or are we seeing some odd behavior from M87?

Some astronomers believe that active nuclei contain large black holes.

In particular, both display the radio jets characteristic of many active galactic nuclei.

He works on active galactic nuclei and the theory of dust tori.

These have been interpreted as manifestations of the (currently weak) active nucleus.