Strong-lensing systems for dark energy models

DOI

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 subsamples 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^1 or high velocity dispersion {sigma}>276km/s). However, we obtained a fiduciary sample with 143 systems, which improves the constraints on each tested cosmological model.

Cone search capability for table J/MNRAS/498/6013/tablea1 (Compilation of 204 strong-lensing measurements)

Identifier
DOI http://doi.org/10.26093/cds/vizier.74986013
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/MNRAS/498/6013
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/498/6013
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/498/6013
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/MNRAS/498/6013
Provenance
Creator Amante M.H.; Magana J.; Motta V.; Garcia-Aspeitia M.A.; Verdugo T.
Publisher CDS
Publication Year 2023
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysical Processes; Astrophysics and Astronomy; Cosmology; Galactic and extragalactic Astronomy; Natural Sciences; Observational Astronomy; Physics