## 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 (time-delay quadruple systems) and 1933+503 (a prospective time-delay system) all together, yielding time-delay predictions for the third lens and a 90% confidence estimate of H _{0} ^{-1} = 14.6 _{-1.7} ^{+9.4} Gyr (H _{0} = 67 _{-26} ^{+9} km s ^{-1} Mpc ^{-1}) assuming Ω _{M}= 0.3 and ΩΛ = 0.7. The other example models the time-delay doubles 1520+530, 1600+434, 1830-211, and 2149-275, which gives H _{0} ^{-1} = 14.5 _{-1.5} ^{+3.3} Gyr (H _{0} = 67 _{-13} ^{+8} 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 coarse-grained results inside a browser and for fine-grained results on a workstation. Several obstacles come up in trying to implement a numerically intensive method thus, but we overcome them.

Original language | English (US) |
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Pages (from-to) | 2604-2616 |

Number of pages | 13 |

Journal | Astronomical Journal |

Volume | 127 |

Issue number | 5 1781 |

DOIs | |

State | Published - May 2004 |

## Keywords

- Gravitational lensing