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We present an analysis of deep mid- to far-infrared (MFIR) Spitzerphotometric observations of the southern 2Jy sample of powerful radio sources(0.05 < z < 0.7), conducting a statistical investigation of the links betweenradio jet, AGN, starburst activity and MFIR properties. This is part of anongoing extensive study of powerful radio galaxies that benefits from bothcomplete optical emission line information and a uniquely high detection ratein the far-infrared (far-IR). We find tight correlations between the MFIR and[OIII] emission luminosities, which are significantly better than those betweenMFIR and extended radio luminosities, or between radio and [OIII] luminosities.Since [OIII] is a known indicator of intrinsic AGN power, these correlationsconfirm AGN illumination of the circum-nuclear dust as the primary heatingmechanism for the dust producing thermal MFIR emission at both 24 and 70microns. We demonstrate that AGN heating is energetically feasible, andidentify the narrow line region clouds as the most likely location of the cool,far-IR emitting dust. Starbursts make a major contribution to the heating ofthe cool dust in only 15-28% of our targets.  We also investigate the orientation dependence of the continuum properties,finding that the broad- and narrow-line objects in our sample with strongemission lines have similar distributions of MFIR luminosities and colours.Therefore our results are entirely consistent with the orientation-basedunified schemes for powerful radio galaxies. However, the weak line radiogalaxies (WLRG) form a separate class of objects with intrinsically lowluminosity AGN in which both the optical emission lines and the MFIR continuumare weak.

The origin of the infrared emission in radio galaxies II: analysis of mid- to far-infrared Spitzer observations of the 2Jy sample