Faraday rotation studies of distant radio sources can constrain the evolution and the origin of
cosmic magnetism. We use data from the LOFAR Two-Metre Sky Survey: Data Release 2
(LoTSS DR2) to study the dependence of the Faraday rotation measure (RM) on redshift. By
focusing on radio sources that are close in terms of their projection on the sky, but physically
unrelated ('random pairs'), we measure the RM difference, ΔRM, between the two sources.
Thus, we isolate the extragalactic contribution to ΔRM from other contributions. We present a�…

Giant radio galaxies (GRGs) are radio galaxies that have projected linear extents of more
than 700 kpc or 1 Mpc, depending on definition. We have carried out a careful visual
inspection in search of GRGs of the Bo�tes LOw-Frequency ARray Deep Field image at 150
MHz. We identified 74 GRGs with a projected size larger than 0.7 Mpc of which 38 are larger
than 1 Mpc. The resulting GRG sky density is about 2.8 (1.43) GRGs per square degree for
GRGs with linear size larger than 0.7 (1) Mpc. We studied their radio properties and the�…