Blazar contribution to non-thermal cosmic backgrounds

E. Cavazzuti, P. Giommi

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We present a new assessment of the contribution of the Blazar population to the extragalactic background radiation across the electromagnetic spectrum. Our calculations rely on deep Blazar radio counts that we have derived combining several radio and multi-frequency surveys. We show that Blazar emission integrated over cosmic time gives rise to a considerable broad-band non-thermal Cosmic Background that in some parts of the electromagnetic spectrum dominates the extragalactic brightness.