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- Title
Cluster strong lensing: a new strategy for testing cosmology with simulations.
- Authors
Killedar, M.; Borgani, S.; Fabjan, D.; Dolag, K.; Granato, G.; Meneghetti, M.; Planelles, S.; Ragone-Figueroa, C.; Heavens, A. F.; Starck, J.-L.; Krone-Martins, A.
- Abstract
Comparisons between observed and predicted strong lensing properties of galaxy clusters have been used to claim either tension or consistency with ΛCDM cosmology. However, standard approaches to such tests are unable to quantify the preference for one cosmology over another. We advocate a Bayesian approach whereby the parameters defining the scaling relation between Einstein radii and cluster mass are treated as the observables. We demonstrate a method of estimating the likelihood for observing these parameters under the ΛCDM framework, using the X-ray selected z > 0.5 MACS clusters as a case in point and employing both N-body and hydrodynamic simulations of clusters. We account for cluster lens triaxiality within the modelling of the likelihood function. Cluster selection criteria is found to play as important a role as the uncertainty related to the description of star formation and feedback.
- Publication
Proceedings of the International Astronomical Union, 2014, Vol 10, Issue S306, p113
- ISSN
1743-9213
- Publication type
Article
- DOI
10.1017/S1743921314010916