Strong lensing, weak lensing, and dynamics in SL2S J02140-0535

T. Verdugo (1) , V. Motta (1) , R. P. Muñoz (1) , M. Limousin (2) , R. Cabanac (3) , J. Richard (4)

1 Departamento de Fisica y Astronomia [Valparaiso]
2 LAM - Laboratoire d'Astrophysique de Marseille
3 LATT - Laboratoire Astrophysique de Toulouse-Tarbes
4 CRAL - Centre de Recherche Astrophysique de Lyon

We combine strong lensing modeling and dynamical constraints in order to probe the mass of SL2S J02140-0535, a galaxy group at z = 0.44 from the Strong Lensing Legacy Survey (SL2S) which has uncovered a new population of group-scale strong lenses. The strong lensing analysis is based on multi-band HST/ACS observations which display strong lensing features that we have followed up spectroscopically with VLT/FORS2. To constrain the scale radius of an NFW mass profile, we propose a new method taking advantage of the large scale dynamical information provided by VLT/FORS2 and KECK/LRIS spectroscopy of group members. This work shows a potentially useful method for constraining large-scale properties inaccessible to strong lensing, such as the scale radius of the NFW profile.

Mots clés: gravitational lensing: strong; galaxies: clusters: individual (SL2S J02140-0535)

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Cosmologie et astrophysique extra-galactique [astro-ph.CO]

T. Verdugo, V. Motta, R. P. Muñoz, M. Limousin, R. Cabanac, et al.. Strong lensing, weak lensing, and dynamics in SL2S J02140-0535. Latin American Regional IAU Meeting, 2011, Mexico. pp.104-105. ⟨hal-00660244⟩