A calibration strategy using full-Jones corrections with an in-field unpolarised calibrator and visibility-based multi-epoch alignment enables sub-arcsecond polarimetric imaging with LOFAR at metre wavelengths.
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DEFROST algorithm disentangles Galactic and extragalactic Faraday rotation in RM catalogs, recovering extragalactic parameters within 5 sigma for sources at absolute Galactic latitude above 45 degrees.
Radio observations of Faraday rotation in CARLA J1510+5958 at z=1.72 yield a lower limit of 0.4 μG on the average magnetic field strength in the proto-intra-cluster medium.
SPICE-RACS DR2 delivers the largest single Faraday rotation measure catalog from a radio survey, with 250,000-340,000 RMs across most of the sky at median uncertainty of 2 rad m^{-2}.
A grid of 434 Faraday rotation measures from MeerKAT polarimetry reveals enhanced RM scatter in the Abell 3391/95 clusters and suggests a relatively ordered magnetic field in the intercluster bridge on ~10 kpc scales.
Bayesian analysis of SKA Faraday rotation data can constrain magnetization in galaxy clusters using about 50,000 measurements with precise redshifts, while filaments remain challenging even with 17,000 spectroscopic redshifts.
Models predict SKA-Low will deliver an RM grid of over 50,000 sources in a 10,000 deg² survey at ~0.05 rad/m² precision, at least 10x denser than current m-λ grids.
This review chapter summarizes the cosmic web's theoretical framework, recent radio observations of diffuse gas, and the expected impact of the SKA on detecting baryons in filaments and cluster outskirts.
Review summarizing observational data on the Milky Way's magnetic field structure, including spiral alignment, halo components, turbulence, and correlations with interstellar gas and dust.
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DEFROST: Detecting Excess in Faraday Rotation thrOugh Sophisticated analysis Techniques
DEFROST algorithm disentangles Galactic and extragalactic Faraday rotation in RM catalogs, recovering extragalactic parameters within 5 sigma for sources at absolute Galactic latitude above 45 degrees.