Broad Iron Emission from Gravitationally Lensed Quasars Observed by Chandra

Abstract

Recent work has demonstrated the potential of gravitationally lensed quasars to extend measurements of black hole spin out to high-redshift with the current generation of X-ray observatories. Here we present an analysis of a large sample of 27 lensed quasars in the redshift range 1.0<z<4.5 observed with Chandra, utilizing over 1.6 Ms of total observing time, focusing on the rest-frame iron K emission from these sources. Although the X-ray signal-to-noise (S/N) currently available does not permit the detection of iron emission from the inner accretion disk in individual cases in our sample, we find significant structure in the stacked residuals. In addition to the narrow core, seen almost ubiquitously in local AGN, we find evidence for an additional underlying broad component from the inner accretion disk, with a clear red wing to the emission profile. Based on simulations, we find the detection of this broader component to be significant at greater than the 3-sigma level. This implies that iron emission from the inner disk is relatively common in the population of lensed quasars, and in turn further demonstrates that, with additional observations, this population represents an opportunity to significantly extend the sample of AGN spin measurements out to high-redshift.

5 pages, 2 figures, accepted for publication in ApJ

References in corpus (8)

• An XMM-Newton survey of broad iron lines in Seyfert galaxies
• Relativistic X-ray Lines from the Inner Accretion Disks Around Black Holes
• NANOGrav Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries in Circular Orbits
• NuSTAR and XMM-Newton Observations of NGC 1365: Extreme Absorption Variability and a Constant Inner Accretion Disk
• Iron K and Compton hump reverberation in SWIFT J2127.4+5654 and NGC 1365 revealed by NuSTAR and XMM-Newton
• The absorption-dominated model for the X-ray spectra of type I active galaxies: MCG-6-30-15
• Reflection From the Strong Gravity Regime in a z=0.658 Gravitationally Lensed-Quasar
• A Rapidly Spinning Black Hole Powers the Einstein Cross

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