Satellites have shown that some active galaxies are also strong emitters of gamma - rays, an even more highly energetic form of light. (stsci.edu)
It is the strong absorbers that are also the strong emitters; the backradiation comes overwhelmingly from those strong absorbers (which are in very close to local thermodynamic equilibrium with the bulk gas). (wattsupwiththat.com)
If so, then I have already answered that point: «It is the strong absorbers that are also the strong emitters; the backradiation comes overwhelmingly from those strong absorbers (which are in very close to local thermodynamic equilibrium with the bulk gas)» (emphasis added). (wattsupwiththat.com)