Pixellated Lenses and Estimates of H_0 from Time-delay Quasars

Details Pixellated Lenses and Estimates of H_0 from Time-delay Quasars Pixellated Lenses and Estimates of H_0 from Time-delay Quasars

1999-09-14

arxiv.org/abs/astro-ph/9909248v1

Astronomy and Astrophysics

Astrophysics

4 pages incl 4 figures. Contributed talk to "Gravitational Lensing: Recent Progress and Future Goals", Boston University, MA,

Scientific paper

The largest source of uncertainty in the determination of H_0 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 H_0. 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 H_0 between 45 and 80 km/s/Mpc at 90% confidence level, with the best estimate of 60 km/s/Mpc.

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