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Title:
Lens modelling and estimate of H0 in quadruply lensed systems
Authors:
Tortora, C.; Piedipalumbo, E.; Cardone, V. F.
Affiliation:
AA(Dipartimento di Scienze fisiche, Università degli studi di Napoli `Federico II', and INFN, Sezione di Napoli Complesso Universitario di Monte S. Angelo, Via Cinthia, Edificio N, 80126 Napoli, Italy), AB(Dipartimento di Scienze fisiche, Università degli studi di Napoli `Federico II', and INFN, Sezione di Napoli Complesso Universitario di Monte S. Angelo, Via Cinthia, Edificio N, 80126 Napoli, Italy), AC(Dipartimento di Fisica `E. R. Caianiello', Università di Salerno and INFN, Sezione di Napoli Gruppo Collegato di Salerno, Via S. Allende, 84081 - Baronissi (Salerno), Italy)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 354, Issue 2, pp. 343-354. (MNRAS Homepage)
Publication Date:
10/2004
Origin:
MNRAS
MNRAS Keywords:
gravitational lensing, quasars: individual: PG 1115+080, quasars: individual: RX J0911+0551, cosmology: theory, distance scale
DOI:
10.1111/j.1365-2966.2004.08160.x
Bibliographic Code:
2004MNRAS.354..343T

Abstract

We present a numerical method to estimate the lensing parameters and the Hubble constant H0 from quadruply imaged gravitational lens systems. The lens galaxy is modelled using both separable deflection potentials and constant mass-to-light ratio profiles, while possible external perturbations have been taken into account by introducing an external shear. The model parameters are recovered by inverting the lens and the time-delay ratio equations and imposing a set of physically motivated selection criteria. We investigate correlations among the model parameters and the Hubble constant. Finally, we apply the codes to the real lensed quasars PG 1115+080 and RX J0911+0551, and combine the results from these two systems to get H0= 56 +/- 23 kms-1Mpc-1. In addition, we are able to fit to the single systems a general elliptical potential with a non-fixed angular part, and then we model the two-lens systems with the same potential and a shared H0: in this last case, we estimate H0= 49+6-11 kms-1 Mpc-1.

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