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Article Contents

ABSTRACT

1.WHY OBSERVING LENSED QUASARS?

2.FIRST DISCOVERIES AND SEARCHES

2.1.A Few Lucky Cases

2.2.Systematic Searches and the Magnification Bias

3.LENSED QUASARS AND H₀

3.1.The Time-delay Method

3.2.Constraints and Uncertainties

3.3.The Mass Model and Degeneracies

4.PG 1115+080: A CLEAN QUADRUPLE

4.1.Redshifts

4.2.Time-delays and Temporal Sampling

4.3.Modeling and Influence of the Astrometry

4.4.HST Imaging: the Quasar Host Galaxy

4.5.Yet Further Constraints: Spectroscopy

4.6.H₀ with PG 1115+080

5.MASS PRODUCTION OF TIME-DELAYS: H₀ WITH OTHER LENSES

REFERENCES