Abstract
Gravitational lensing improves the contrast of a quasar host galaxy because the extended emission is stretched away from the nucleus at constant surface brightness. As a result, the lensing technique is sensitive to low luminosity hosts at high redshift, using samples that are unlikely to be biased by host galaxy properties. In data from the CASTLES project, lensed host light is detected in roughly 2/3 of the cases. Hosts of radio-quiet quasars have modest luminosity (L < L*) at z ~ 2, and they are 2-5 times fainter than hosts of radio-loud quasars at the same epoch. The comparison with low redshift, radio-quiet hosts suggests rapid early growth of quasar black holes.
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