Galaxy clusters as gravitational lenses play a unique role in astrophysics and cosmology:
they permit mapping the dark matter distribution on a range of scales; they reveal the …

Context. Previous studies have revealed that the estimated probability of galaxy-galaxy
strong lensing in observed galaxy clusters exceeds the expectations from the Λ cold dark …

Context. An excess of galaxy–galaxy strong lensing (GGSL) in galaxy clusters compared to
expectations from the Λ cold-dark-matter (CDM) cosmological model has recently been …

The combination of multi-band imaging from the Hubble Space Telescope with Multi-Unit
Spectroscopic Explorer integral field spectroscopy, obtained at the Very Large Telescope …

Context. Several recent studies have highlighted a discrepancy between the strong lensing
(SL) properties of observed cluster galaxies and the predictions of Λ cold dark matter (CDM) …

Strong gravitational lensing offers a powerful probe of the detailed distribution of matter in
lenses, while magnifying and bringing faint background sources into view. Observed strong …

Substructures are known to be good tracers for the dynamical states and recent accretion
histories of the most massive collapsed structures in the universe, galaxy clusters …

We present a detailed strong lensing analysis of the massive and distant (z= 0.870) galaxy
cluster ACT-CL J0102− 4915 (ACT0102, also known as El Gordo), taking advantage of new …

Gravitational lensing by galaxy clusters has emerged as a powerful tool to probe the
standard cold dark matter (CDM) paradigm of structure formation in the Universe. Despite …

Forthcoming imaging surveys will increase the number of known galaxy-scale strong lenses
by several orders of magnitude. For this to happen, images of billions of galaxies will have to …