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We combine IR, optical and X-ray data from the overlapping, 9.3 square degreeNOAO Deep Wide-Field Survey (NDWFS), AGN and Galaxy Evolution Survey (AGES),and XBootes Survey to measure the X-ray evolution of 6146 normal galaxies as afunction of absolute optical luminosity, redshift, and spectral type over thelargely unexplored redshift range 0.1 < z < 0.5. Because only the closest orbrightest of the galaxies are individually detected in X-rays, we use astacking analysis to determine the mean properties of the sample. Our resultssuggest that X-ray emission from spectroscopically late-type galaxies isdominated by star formation, while that from early-type galaxies is dominatedby a combination of hot gas and AGN emission. We find that the mean starformation and supermassive black hole accretion rate densities evolve like(1+z)^3, in agreement with the trends found for samples of bright, individuallydetectable starburst galaxies and AGN. Our work also corroborates the resultsof many previous stacking analyses of faint source populations, with improvedstatistics.

The Star Formation and Nuclear Accretion Histories of Normal Galaxies in the AGES Survey