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We present Spitzer photometric data for a complete sample of 19 low redshift(z<0.1) 3CRR radio galaxies as part of our efforts to understand the origin ofthe prodigious mid- to far-infrared (MFIR) emission from radio-loud AGN. Ourresults show a correlation between AGN power (indicated by [OIII] 5007 emissionline luminosity) and 24 micron luminosity. This result is consistent with the24 micron thermal emission originating from warm dust heated directly by AGNillumination. Applying the same correlation test for 70 micron luminosityagainst [OIII] luminosity we find this relation to suffer from increasedscatter compared to that of 24 micron. In line with our results for thehigher-radio-frequency-selected 2Jy sample, we are able to show that much ofthis increased scatter is due to heating by starbursts which boost thefar-infrared emission at 70 micron in a minority of objects (17-35%). Overallthis study supports previous work indicating AGN illumination as the dominantheating mechanism for MFIR emitting dust in the majority of low to intermediateredshift radio galaxies (0.03<z<0.7), with the advantage of strong statisticalevidence. However, we find evidence that the low redshift broad-line objects(z<0.1) are distinct in terms of their positions on the MFIR vs. [OIII]correlations.

The origin of the infrared emission in radio galaxies. III. Analysis of 3CRR objects