Abstract
For a multiple QSO, the propagation time from the source to the observer varies from the image i to the image j, and this difference (▵τij) can be measured when the source is variable. In general, assuming a flat universe without cosmological constant, the parameter ▵τij x 0 (H0 is the Hubble constant) depends on the redshifts of the lens and the source, as well as the positions of the individual images and the source (2, j), and the scaled surface potential Ψa at i and j (see, e.g., Blandford and Kundic 1996, Williams and Schechter 1997). The observations of multiple images of the same source are used to infer and the adjustable parameters α ≡ (α1,...,αp) that appear in the picture of the deflector, i.e., a lens model. From the lens model corresponding to the lens picture, ▵τij, i, j and the redshifts, one obtains H0.
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© 1999 Springer Science+Business Media Dordrecht
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Goicoechea, L.J., Mediavilla, E., Oscoz, A., Serra, M., Buitrago, J. (1999). Gravitational Lenses and the Hubble Constant: Present and Future. In: Lago, M.T.V.T., Blanchard, A. (eds) The Non-Sleeping Universe. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4497-1_86
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DOI: https://doi.org/10.1007/978-94-011-4497-1_86
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-5923-7
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