Speaker
Description
Polarisation studies over a significant redshift range are an important tool in understanding the evolution of cosmic magnetic fields and unrevealing their origin. As most depolarisation effects are highly wavelength depended, the combination of different surveys allows us to distinguish between different effects.
We use the synergy of LOFAR and Apertif; starting with sources known to show significant polarised emission at 144\,MHz, we image their 1.4\,GHz counterparts and construct a catalogue of 598 polarised sources.
We present preliminary results of the comparison of polarisation properties and Rotation Measure values at 1.4\,GHz and 144\,MHz, including the first redshift-dependent estimate of the Rotation Measure dispersion in cosmic web filaments.
