| Recent surveys exploiting the capabilities of new instruments such MUSE and KCWI are finally providing a large statistical sample of three-dimensional images of rest-frame-UV line emission from “cold” gas haloes (and sometimes filaments) around galaxies, which are ubiquitously detected in the surrounding of quasars at all explored redshifts. In this talk, I will review these exciting results and discuss how they can provide new learning opportunities for our understanding of the physical properties of gas around massive galaxies and high-redshift galaxy formation. In particular, I will present ongoing deep and wide follow-up studies on some quasar fields which are revealing the CGM and Cosmic Web properties on both kpc and Mpc-scales and present complementary multi-wavelength surveys using ALMA, JWST, Chandra, HST and ground-based imaging of these fields. |
