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Cluster strong lensing: a new strategy for testing cosmology with simulations

Published online by Cambridge University Press:  01 July 2015

M. Killedar ,
S. Borgani ,
D. Fabjan ,
K. Dolag ,
G. Granato ,
M. Meneghetti ,
S. Planelles  and
C. Ragone-Figueroa
M. Killedar
Affiliation:
Universitäts-Sternwarte München, Scheinerstrasse 1, D-81679, München, Germany e-mail: killedar@usm.lmu.de Astronomy Unit, Department of Physics, University of Trieste, Via Tiepolo 11, I-34131 Trieste, Italy INAF - Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy
S. Borgani
Affiliation:
Astronomy Unit, Department of Physics, University of Trieste, Via Tiepolo 11, I-34131 Trieste, Italy INAF - Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy INFN - National Institute for Nuclear Physics, Via Valerio 2, I-34127 Trieste, Italy
D. Fabjan
Affiliation:
SPACE-SI, Slovenian Centre of Excellence for Space Sciences and Technologies, Aškerčeva 12, 1000 Ljubljana, Slovenia Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
K. Dolag
Affiliation:
Universitäts-Sternwarte München, Scheinerstrasse 1, D-81679, München, Germany e-mail: killedar@usm.lmu.de Max-Planck-Institut für Astrophysik, Garching, Germany
G. Granato
Affiliation:
Astronomy Unit, Department of Physics, University of Trieste, Via Tiepolo 11, I-34131 Trieste, Italy INAF - Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy
M. Meneghetti
Affiliation:
INAF - Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, Italy INFN - Sezione di Bologna, Viale Berti Pichat 6/2, I-40127 Bologna, Italy Jet Propulsion Laboratory, 4800 Oak Grove Dr. Pasadena, CA 91109, USA
S. Planelles
Affiliation:
Astronomy Unit, Department of Physics, University of Trieste, Via Tiepolo 11, I-34131 Trieste, Italy INAF - Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy
C. Ragone-Figueroa
Affiliation:
INAF - Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste, Italy Instituto de Astronomía Teórica y Experimental (IATE), Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET), Observatorio Astronómico, Universidad Nacional de Córdoba, Laprida 854, X5000BGR, Córdoba, Argentina
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Abstract

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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.

Keywords

cosmology: miscellaneousgravitational lensinggalaxies: clusters: generalmethods: n-body simulationsmethods: statisticalX-rays: galaxies: clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S306: Statistical Challenges in 21st Century Cosmology , May 2014 , pp. 113 - 115
Copyright
Copyright © International Astronomical Union 2015 

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