Speaker
Description
Magnetic fields are now known to permeate the full hierarchy of cosmic structure, from galaxies and clusters to filaments and the most diffuse phases of the cosmic web. However, their origin and evolution remain poorly constrained, particularly in low-density environments where direct observational probes are scarce.
In this talk, I will present recent progress in tracing the magnetised Universe using Faraday rotation measurements from wide-area radio surveys, including new results from ASKAP and LOFAR that probe the CGM, intragroup and intracluster medium, and large-scale filamentary structures. These measurements reveal the signature of magnetised gas well beyond cluster cores, but remain fundamentally limited by degeneracies between magnetic field strength, electron density, and path length.
I will highlight the transformative potential of combining these radio measurements with future Sunyaev–Zel’dovich (SZ) observations from AtLAST. The combination of Faraday rotation and SZ diagnostics offers a powerful, complementary approach to disentangling the density and magnetic field structure of the cosmic web, opening a new window on the co-evolution of gas and magnetic fields across cosmic time.