Strong Lensing Modeling in Galaxy Clusters as a Promising Method to Test Cosmography. I. Parametric Dark Energy Models
Articolo
Data di Pubblicazione:
2018
Citazione:
Strong Lensing Modeling in Galaxy Clusters as a Promising Method to Test Cosmography. I. Parametric Dark Energy Models / J. Magana, A. Acebron Munoz, V. Motta, T. Verdugo, E. Jullo, M. Limousin. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 865:2(2018), pp. 122.1-122.17. [10.3847/1538-4357/aada7d]
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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
cosmological parameters; dark energy; gravitational lensing: strong
Elenco autori:
J. Magana, A. Acebron Munoz, V. Motta, T. Verdugo, E. Jullo, M. Limousin
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