Pixellated Lenses and Estimates of H₀ from Time-delay Quasars
Williams, Liliya L. R. · Saha, Prasenjit
Original · EN
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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