A Portable Modeler of Lensed Quasars
Abstract
We introduce and implement two novel ideas for modeling lensed quasars. The first is to require different lenses to agree about H_{0}. This means that some models for one lens can be ruled out by data on a different lens. We explain using two worked examples. One example models 1115+080 and 1608+656 (timedelay quadruple systems) and 1933+503 (a prospective timedelay system) all together, yielding timedelay predictions for the third lens and a 90% confidence estimate of H^{1}_{0}=14.6^{+9.4}_{1.7} Gyr (H_{0}=67^{+9}_{26} km s^{1} Mpc^{1}) assuming Ω_{M}=0.3 and Ω_{Λ}=0.7. The other example models the timedelay doubles 1520+530, 1600+434, 1830211, and 2149275, which gives H^{1}_{0}=14.5^{+3.3}_{1.5} Gyr (H_{0}=67^{+8}_{13} km s^{1} Mpc^{1}). Our second idea is to write the modeling software as a highly interactive Java applet, which can be used both for coarsegrained results inside a browser and for finegrained results on a workstation. Several obstacles come up in trying to implement a numerically intensive method thus, but we overcome them.
 Publication:

The Astronomical Journal
 Pub Date:
 May 2004
 DOI:
 10.1086/383544
 arXiv:
 arXiv:astroph/0402135
 Bibcode:
 2004AJ....127.2604S
 Keywords:

 Cosmology: Gravitational Lensing;
 Astrophysics
 EPrint:
 31 pages, incl. 15 figs