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We aim to probe the mass of SL2S\,J02140-0535, a galaxy group at $z$ = 0.44from the Strong Lensing Legacy Survey (SL2S). We combine strong lensingmodeling and dynamical constraints. The strong lensing analysis is based onmulti-band HST/ACS observations exhibiting strong lensing features that we havefollowed-up spectroscopically with VLT/FORS2. To constrain the scale radius ofan NFW mass profile that cannot be constrained by strong lensing, we propose anew method by taking advantage of the large-scale dynamical informationprovided by VLT/FORS2 and KECK/LRIS spectroscopy of group members. In constrastto other authors, we show that the observed lensing features inSL2S\,J02140-0535 belong to different background sources: one at $z$ = 1.7$\pm$ 0.1 produces three images, while the other at $z$ = 1.023 $\pm$ 0.001 hasonly a single image. Our unimodal NFW mass model reproduces these images verywell. It is characterized by a concentration parameter $c_{200}$ = 6.0 $\pm$0.6, which is slightly greater than the value expected from $\Lambda$CDMsimulations for a mass of M$_{200}$ $\approx$ 1 $\times$ 10$^{14}$ M$_{\sun}$.The spectroscopic analysis of group members also reveals a unimodal structurethat exhibits no evidence of merging. We compare our dynamic mass estimate withan independent weak-lensing based mass estimate finding that both areconsistent. Our combined lensing and dynamical analysis of SL2S\,J02140-0535demonstrates the importance of spectroscopic information in reliablyidentifying the lensing features. Our findings argue that the system is arelaxed, massive galaxy group where mass is traced by light. This work shows apotentially useful method for constraining large-scale properties inaccessibleto strong lensing, such as the scale radius of the NFW profile.

Gravitational lensing and dynamics in SL2S\,J02140-0535: Probing the mass out to large radius