Comparison of X-ray and Optical/UV Eddington Ratio Estimates in Quasars

We request 190 ks on a uniform sample of 12 opticallyselected, lowz,radioquiet SDSS quasars. The range of L/LEdd complement the virgul60 wellstudied,but potentially biased (in terms of L/LEdd) reverberation mapped.. (RM)quasars. With both SDSS and HST spectroscopy, we are able to estimate L/Leddfrom 3 optical/UVbased estimators. Xray data from Chandra enables a 4thL/LEdd estimator (alpha_ox) for the full sample of 25 objects. The 12 proposedtargets lack sufficient Chandra counts to investigate the robustness of the hardXray spectral index, Gamma, as an indicator of L/LEdd. Our observations willenable intercomparison of 5 optical/UV and Xray estimators of L/LEdd for awelldefined sample of quasars. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]