Constraints on (Omega_M0, Omega_Lambda) from strong lensing in AC 114
Abstract
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.
Cite
@article{arxiv.astro-ph/0205357,
title = {Constraints on (Omega_M0, Omega_Lambda) from strong lensing in AC 114},
author = {G. Golse and J. -P. Kneib and G. Soucail},
journal= {arXiv preprint arXiv:astro-ph/0205357},
year = {2007}
}
Comments
4 pages, 4 figures. To appear in the proceedings of the "XXXVIIe Rencontres de Moriond : Le Modele Cosmologique /The Cosmological Model" (March 16-23, 2002)