A Comprehensive Spitzer Survey of High-z Radio Galaxies

Observational evidence suggests that Radio Galaxies are hosted by massive elliptical galaxies (M_sun=10**[11.5-12]) at every redshift. Using Spitzer we can for the first time measure the peak of the stellar luminosity at rest-frame NIR. From a sample of the 70 most well studied HzRGs we can directly derive their stellar mass from modeling of the SEDs using IRAC and MIPS data, and we find that radio galaxies are indeed hosted by massive galaxies. Combining the MIPS data with submm observations we can estimate the dust mass and hence the total Baryonic mass of these systems. A programme of X-ray observations is underway to estimate the mass of the central Black Holes. I will also briefly talk about the search for high-z Radio Galaxies from sub-mJy ultra steep spectrum radio sources which have been observed with Spitzer.