Pixellated Lenses and Estimates of H0 from Time-delay Quasars
Abstract
The largest source of uncertainty in the determination of H0 from a multiply-imaged QSO system is the unknown mass distribution in the lensing galaxy. Parametric models severely restrict the shape of the galaxy thereby underestimating errors and biasing the best estimate of H0. We present a method that explores the whole of the model space allowed by the image observables and a few general properties of galaxies. We describe blind test of the method and then apply it to PG1115+080 and B1608+656 which yield H0 between 45 and 80 km/s/Mpc at 90% confidence level, with the best estimate of 60 km/s/Mpc.
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