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American Astronomical Society, Astrophysical Journal, 1(806), p. 4, 2015

DOI: 10.1088/0004-637x/806/1/4

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Clash: The Concentration-Mass Relation of Galaxy Clusters

Journal article published in 2015 by J. Merten, M. Meneghetti ORCID, M. Postman, K. Umetsu ORCID, A. Zitrin ORCID, E. Medezinski, M. Nonino ORCID, A. Koekemoer ORCID, P. Melchior, D. Gruen, La A. Moustakas, M. Bartelmann, O. Host, M. Donahue ORCID, D. Coe ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We present a new determination of the concentration-mass relation for galaxy clusters based on our comprehensive lensing analysis of 19 X-ray selected galaxy clusters from the Cluster Lensing and Supernova Survey with Hubble (CLASH). Our sample spans a redshift range between 0.19 and 0.89. We combine weak lensing constraints from the Hubble Space Telescope (HST) and from ground-based wide field data with strong lensing constraints from HST. The result are reconstructions of the surface-mass density for all CLASH clusters on multi-scale grids. Our derivation of NFW parameters yields virial masses between 0.53 x 10^15 and 1.76 x 10^15 M_sol/h and the halo concentrations are distributed around c_200c ~ 3.7 with a 1-sigma significant negative trend with cluster mass. We find an excellent 4% agreement between our measured concentrations and the expectation from numerical simulations after accounting for the CLASH selection function based on X-ray morphology. The simulations are analyzed in 2D to account for possible biases in the lensing reconstructions due to projection effects. The theoretical concentration-mass (c-M) relation from our X-ray selected set of simulated clusters and the c-M relation derived directly from the CLASH data agree at the 90% confidence level. ; Comment: 24 pages, 15 figures and 10 tables. Submitted to ApJ. (Minor, non-scientific changes since ver1, added acknowledgement, added arXiv references to companion papers, fixed arXiv author list mistake.)