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Recent work has demonstrated the potential of gravitationally lensed quasarsto extend measurements of black hole spin out to high-redshift with the currentgeneration of X-ray observatories. Here we present an analysis of a largesample of 27 lensed quasars in the redshift range 1.0<z<4.5 observed withChandra, utilizing over 1.6 Ms of total observing time, focusing on therest-frame iron K emission from these sources. Although the X-raysignal-to-noise (S/N) currently available does not permit the detection of ironemission from the inner accretion disk in individual cases in our sample, wefind significant structure in the stacked residuals. In addition to the narrowcore, seen almost ubiquitously in local AGN, we find evidence for an additionalunderlying broad component from the inner accretion disk, with a clear red wingto the emission profile. Based on simulations, we find the detection of thisbroader component to be significant at greater than the 3-sigma level. Thisimplies that iron emission from the inner disk is relatively common in thepopulation of lensed quasars, and in turn further demonstrates that, withadditional observations, this population represents an opportunity tosignificantly extend the sample of AGN spin measurements out to high-redshift.

Broad Iron Emission from Gravitationally Lensed Quasars Observed by Chandra