New constraints on the magnetization of the cosmic web using LOFAR Faraday rotation observations

Understand

Measuring the properties of extragalactic magnetic fields through the effect of Faraday rotation provides a means to understand the origin and evolution of cosmic magnetism.

• Here we use data from the LOFAR Two-Metre Sky Survey (LoTSS) to calculate the Faraday rotation measure (RM) of close pairs of extragalactic radio sources.
• By considering the RM difference ($\Delta$RM) between physical pairs (e.g.
• double-lobed radio galaxies) and non-physical pairs (i.e.