Strong Lensing in Abell 1703: Constraints on the Slope of the Inner Dark Matter Distribution - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2008

Strong Lensing in Abell 1703: Constraints on the Slope of the Inner Dark Matter Distribution

J. Richard
H. Brink
  • Fonction : Auteur
R. Pello
  • Fonction : Auteur
E. Jullo
H. Tu
  • Fonction : Auteur
J. Sommer-Larsen
  • Fonction : Auteur
E. Egami
  • Fonction : Auteur
M. J. Michalowski
  • Fonction : Auteur
R. Cabanac
  • Fonction : Auteur
D. P. Stark
  • Fonction : Auteur

Résumé

In this article, we apply strong lensing techniques in Abell 1703, a massive X-ray luminous galaxy cluster at z=0.28. Our analysis is based on imaging data both from space and ground in 8 bands, complemented with a spectroscopic survey. Abell 1703 looks rather circular from the general shape of its multiply imaged systems and present a dominant giant elliptical cD galaxy in its centre. This cluster exhibits a remarkable bright 'central ring' formed by 4 bright images at z_{spec}=0.888 located very close to the cD galaxy, providing observational constraints that are potentially very interesting to probe the central mass distribution. The stellar contribution from the cD galaxy (~1.25 10^{12} M_{sun} within 7") is accounted for in our parametric mass modelling, and the underlying smooth dark matter component distribution is described using a generalized NFW profile parametrized with a central logarithmic slope \alpha. We find that within the range where observational constraints are present (from ~5" to ~50"), the slope of the dark matter distribution in Abell1703 is equal to 1.09^{+0.05}_{-0.11} (3\sigma confidence level). The concentration parameter is equal to c_{200} ~ 3.5, and the scale radius is constrained to be larger than the region where observational constraints are available. Within this radius, the 2D mass is equal to M(50")=2.4 10^{14} M_{\sun}. We cannot draw any conclusions on cosmological models at this point since we lack results from realistic numerical simulations containing baryons to make a proper comparison. We advocate the need for a sample of observed and simulated unimodal relaxed galaxy clusters in order to make reliable comparisons, and potentially provide a test of cosmological models.

Dates et versions

hal-00370505 , version 1 (24-03-2009)

Identifiants

Citer

M. Limousin, J. Richard, J. -P. Kneib, H. Brink, R. Pello, et al.. Strong Lensing in Abell 1703: Constraints on the Slope of the Inner Dark Matter Distribution. 2008. ⟨hal-00370505⟩
33 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More