Probing the Limits of Nuclear Activity in COSMOS

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This research program will use the multiwavelength data on the COSMOS field to select Active Galactic Nuclei (AGNs) with a wide range of optical and IR properties. Multi-object spectroscopy with Magellan/IMACS will be used to spectroscopically confirm ~3000 AGNs, reaching the classical Seyfert/quasar boundary at a redshift of 3 and including about 300 quasars with redshift 3. The deep multiwavelength observations will allow studies of the total AGN energy density in the universe, including a bolometric luminosity function for obscured AGN to redshift ~1 and Type 1 AGN to redshfit ~4. Time domain data will be used to measure reverberation between the continuum and the lines.