Star formation in QSOs at the peak of cosmic quasar activity

Details Star formation in QSOs at the peak of cosmic quasar activity Star formation in QSOs at the peak of cosmic quasar activity

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30314l&link_type=abstract

Spitzer Proposal ID #30314

Physics

Scientific paper

Co-evolution of luminous AGN and powerful starbursts is a key aspect of galaxy evolution, indicated by the similar evolution with number densities peaking at z~2-3 for both quasars and submillimeter galaxies. It likely implies coexistence of significant accretion and star formation in the same objects, luminous high redshift quasars. While variously suspected from models and indirect arguments, this coexistence has not yet been reliably demonstrated due to the difficulty of detecting star formation tracers in the presence of the bright central AGN. We propose to use IRS spectroscopy of aromatic 'PAH' emission features to investigate whether extremely powerful L ~ 10^13 LSun starbursts are indeed present in luminous radio-quiet QSOs near the z~2 peak of cosmic quasar activity. We will test the idea that the rest frame far-infrared/submm emission of these objects arises largely from star formation. Our targets all have robust mm or submm detections, maximizing chances for IRS detections. This study builds on our previous use of IRS, where we have demonstrated for submillimeter galaxies that PAH emission from L ~ 10^13 LSun star formation at z~2.5 is detectable with IRS, and shown for a sample of lower luminosity local PG QSOs that AGN activity and star formation are connected, the latter producing most of the far-infrared emission.

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