Large-scale impact of the cosmological population of expanding radio galaxies

We seek to compute the fraction of the volume of the universe filled by expanding cocoons of the cosmological population of radio galaxies over the Hubble time as well as the magnetic field infused by them, in order to assess their importance in the cosmic evolution of the universe. Using N-body Lambda CDM simulations, radio galaxies distributed according to the observed radio luminosity function are allowed to evolve in a cosmological volume as using well-defined prescriptions for their expansion. We find that the radio galaxies permeate 10%-30% of the total volume with similar to 10(-8) G magnetic field by the present epoch.