Constraints on (Omega_M0, Omega_Lambda) from strong lensing in AC 114

Details Constraints on (Omega_M0, Omega_Lambda) from strong lensing in AC 114 Constraints on (Omega_M0, Omega_Lambda) from strong lensing in AC 114

2002-05-21

arxiv.org/abs/astro-ph/0205357v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures. To appear in the proceedings of the "XXXVIIe Rencontres de Moriond : Le Modele Cosmologique /The Cosmologi

Scientific paper

We use a strong lensing inversion in the cluster of galaxies AC 114 to derive constraints on the cosmological parameters Omega_M0 and Omega_Lambda. If it is possible to measure spectroscopically the redshifts of many multiple images then one can in principle constrain (Omega_M0,Omega_Lambda) through ratios of angular diameter distances, independently of any external assumptions. Numerical tests on simulated data show rather good constraints from this test. We also use an analytic ``pseudo-elliptical'' NFW profile in the simulations, following the general new formalism we present. An application to AC 114 favors a flat Universe, an EdS model being marginally ruled out.

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