Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-34448
Sereno, M; Jetzer, P; Lubini, M (2010). On the overconcentration problem of strong lensing clusters. Monthly Notices of the Royal Astronomical Society, 403(4):2077-2087.
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Λ cold dark matter paradigm predicts that galaxy clusters follow a universal mass density profile and fit a well-defined mass-concentration relation, with lensing clusters being preferentially triaxial haloes elongated along the line of sight. Oddly, recent strong and weak lensing analyses of clusters with a large Einstein radius suggested those haloes to be highly overconcentrated. Here, we investigate what intrinsic shape and orientation a halo should have to account for both theoretical predictions and observations. We considered a sample of 10 strong lensing clusters. We first measured their elongation assuming a given mass-concentration relation. Then, for each cluster, we found the intrinsic shape and orientation which are compatible with the inferred elongation and the measured projected ellipticity. We distinguished two groups. The first one (nearly one-half) seems to be composed of outliers of the mass-concentration relation, which they would fit only if they were characterized by a filamentary structure extremely elongated along the line of sight, that is not plausible considering standard scenarios of structure formations. The second sample supports expectations of N-body simulations which prefer mildly triaxial lensing clusters with a strong orientation bias.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute for Computational Science|
|Deposited On:||02 Mar 2011 15:32|
|Last Modified:||31 Jan 2014 04:11|
|Additional Information:||The definitive version is available at www.blackwell-synergy.com|
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