Galaxy M87 is unique for three reasons.  First, it   is easily observable,    It has twin jets, each some 5,000 light years long, and most importantly  its core has little or no angular momentum.   The latter point is very important, as if M87`s Core possessed  angular momentum it would be a spiral galaxy.

 JETTING AND ANGULAR MOMENTUM ARE THE UNIVERSAL  PRIME MOVER

Universal,   Galactic,  Stellar and  Solar  Systems,  stabilise as the progenitor jetting bodies lose their ability to   Jet   at  escape velocities.  

     Just as   electrons jump  (orbital)  shells  when they absorb or emit  photons,   the jetting core  pressure fluctuates,   causing  shifts in the vector component   of the jets  ie.   this  effects how high the jets can  actually jet.   This is not unlike turning up the lawn sprinkler tap.  Initially  the core jetted    at escape velocity.  (see Hypervelocity Stars   Warren Brown Harvard cfa / Unbound Stars.  )  As mass loss  proceeds  jetting capability  falls  first to Orbital velocity   eg.  (The Core jets  planetary Cores  )  eg  Pluto   /  Saturn. Massive mass loss, assigns jetting to the inner planets.  As the jets are identical,  the jetted bodies are extremely similar. Planetary bodies are jetted in pairs. Take a look.

Kevin Wilson
Centre for Solar Studies
London