Testing dark energy models with a new sample of strong-lensing systems

Abstract

Inspired by a new compilation of strong lensing systems, which consist of 204 points in the redshift range $0.0625<z_l<0.958$ for the lens and $0.196<z_s<3.595$ for the source, we constrain three models that generate a late cosmic acceleration: the $\omega$-cold dark matter model, the Chevallier-Polarski-Linder and the Jassal-Bagla-Padmanabhan parametrizations. Our compilation contains only those systems with early type galaxies acting as lenses, with spectroscopically measured stellar velocity dispersions, estimated Einstein radius, and both the lens and source redshifts. We assume an axially symmetric mass distribution in the lens equation, using a correction to alleviate differences between the measured velocity dispersion ($\sigma$) and the dark matter halo velocity dispersion (${\sigma }_{DM}$) as well as other systematic errors that may affect the measurements. We have considered different sub-samples to constrain the cosmological parameters of each model. Additionally, we generate a mock data of SLS to asses the impact of the chosen mass profile on the accuracy of Einstein radius estimation. Our results show that cosmological constraints are very sensitive to the selected data: some cases show convergence problems in the estimation of cosmological parameters (e.g. systems with observed distance ratio $D^{obs}<0.5$), others show high values for the chi-square function (e.g. systems with a lens equation $D^{obs}>1$ or high velocity dispersion $\sigma >276$ km s${}^{-1}$). However, we obtained a fiduciary sample with 143 systems which improves the constraints on each tested cosmological model.

arXiv comment21 pages, 9 figures, Accepted for publication in MNRAS

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