2017/11/30 by Juan Magaña, Juan Magana, Ana Acebron +7
Physics and Astronomy · #Astrophysics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Physics #Redshift #Stellar, planetary, and galactic studies #Strong gravitational lensing #Weak gravitational lensing #astro-ph.CO
paper · pdf · doi:10.3847/1538-4357/aada7d
Accepted for publication in ApJ. We include the FOM values in the tables and improve discussion. Typos corrected and some references added. Conclusions unchanged
arxiv created 2018/08/14 · openalex publication_date 2018/09/28 · arxiv updated 2018/10/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Abstract In this paper we probe five cosmological models for which the dark energy equation of state parameter, w ( z ), is parameterized as a function of redshift using strong lensing data in the galaxy cluster Abell 1689. We constrain the parameters of the w ( z ) functions by reconstructing the lens model under each one of these cosmologies with strong lensing measurements from two galaxy clusters, Abell 1689 and a mock cluster, Ares, from the Hubble Frontier Fields Comparison Challenge, to validate our methodology. To quantify how the cosmological constraints are biased due to systematic effects in the strong lensing modeling, we carry out three runs considering the following uncertainties for the multiple image positions: 0.″25, 0.″5, and 1.″0. With Ares, we find that larger errors decrease the systematic bias on the estimated cosmological parameters. With real data, our strong-lensing constraints on w ( z ) are consistent with those derived from other cosmological probes. We confirm that strong lensing cosmography with galaxy clusters is a promising method to constrain w ( z ) parameterizations. A better understanding of galaxy clusters and their environment is needed, however, to improve the SL modeling and hence to estimate stringent cosmological parameters in alternative cosmologies.