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Using the Spitzer Space Telescope, we have obtained 3.6--24 micron photometryof 38 radio galaxies and 24 quasars from the 3CR catalog at redshift 1<z<2.5.This 178 MHz-selected sample is unbiased with respect to orientation andtherefore suited to study orientation-dependent effects in the most powerfulactive galactic nuclei (AGN). Quasar and radio galaxy subsamples matched inisotropic radio luminosity are compared. The quasars all have similar spectralenergy distributions (SEDs), nearly constant in nu F_nu through the rest 1.6-10micron range, consistent with a centrally heated dust distribution whichoutshines the host galaxy contribution. The radio galaxy SEDs show largerdispersion, but the mean radio galaxy SED declines from rest 1.6 to 3 micronand then rises from 3 to 8 micron. The radio galaxies are on average a factor3-10 less luminous in this spectral range than the quasars. Thesecharacteristics are consistent with composite emission from a heavily reddenedAGN plus starlight from the host galaxy. The mid-infrared colors and radio tomid-infrared spectral slopes of individual galaxies are also consistent withthis picture. Individual galaxies show different amounts of extinction and hostgalaxy starlight, consistent with the orientation-dependent unified scheme.

Near- and mid-infrared photometry of high-redshift 3CR sources