Active galaxies can make axionic dark energy
  AGN jets carry helical magnetic fields, which can affect dark matter if the latter is axionic. This preliminary study shows that, in the presence of strong helical magnetic fields, the nature of the axionic condensate may change and become dark energy. Such dark energy may affect galaxy formation and galactic dynamics, so this possibility should not be ignored when considering axionic dark matter. 
Konstantinos Dimopoulos and Sam Cormack
astro-ph.HE astro-ph.CO gr-qc hep-ph