gravitational lensing: strong
galaxies: clusters: general
galaxies: clusters: individual: Abell 1835
cosmic background radiation
cosmology: observations
X-rays: galaxies: clusters
[PHYS.ASTR.CO] Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics
[SDU.ASTR.CO] Sciences of the Universe/Astrophysics/Cosmology and Extra-Galactic Astrophysics