The mass-concentration relation in lensing clusters: the role of statistical biases and selection effects
Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Date Issued
2015
Author(s)
Sereno, Mauro
•
GIOCOLI, CARLO
•
ETTORI, STEFANO
•
MOSCARDINI, LAURO
Description
MS thanks Keiichi Umetsu for useful discussions and Adi Zitrin and Julian Merten for providing useful information on the SL analysis of the CLASH clusters. LM and MS acknowledge financial contributions from contracts ASI/INAF I/023/12/0, by the PRIN MIUR 2010-2011 ‘The dark Universe and the cosmic evolution of baryons: from current surveys to Euclid’ and by the PRIN INAF 2012 ‘The Universe in the box: multiscale simulations of cosmic structure’. CG's research is part of the project GLENCO, funded under the European Seventh Framework Programme, Ideas, Grant Agreement no. 259349.
Abstract
The relation between mass and concentration of galaxy clusters traces their formation and evolution. Massive lensing clusters were observed to be overconcentrated and following a steep scaling in tension with predictions from the concordance Λ cold dark matter (ΛCDM) paradigm. We critically revise the relation in the CLASH (Cluster Lensing And Supernova survey with Hubble), the SGAS (Sloan Giant Arcs Survey), the LOCUSS (Local Cluster Substructure Survey), and the high-redshift samples of weak lensing clusters. Measurements of mass and concentration are anti-correlated, which can bias the observed relation towards steeper values. We corrected for this bias and compared the measured relation to theoretical predictions accounting for halo triaxiality, adiabatic contraction of the halo, presence of a dominant brightest cluster galaxy, and, mostly, selection effects in the observed sample. The normalization, the slope, and the scatter of the expected relation are strongly sample-dependent. For the considered samples, the predicted slope is much steeper than that of the underlying relation characterizing dark matter-only clusters. We found that the correction for statistical and selection biases in observed relations mostly solve the tension with the ΛCDM model.
Volume
449
Issue
2
Start page
2024
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.449.2024S
Rights
open.access
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