MaDCoWS clusters richness

In the distant Universe (i.e. z>0.6), such sources have been observed only in a handful of systems, and their study is important to understand the evolution of large-scale magnetic fields over the cosmic time. Previous studies of nine Planck clusters up to z~0.9 suggest a fast amplification of cluster-scale magnetic fields, at least up to half of the current Universe's age, and steep spectrum cluster scale emission, in line with particle re-acceleration due to turbulence.

In this paper, we investigate the presence of diffuse radio emission in a larger sample of galaxy clusters reaching even higher redshifts (i.e. z?~1). We selected clusters from the Massive and Distant Clusters of WISE Survey (MaDCoWS) with richness {lambda}15>40 covering the area of the second data release of the LOFAR Two-Meter Sky Survey (LoTSS-DR2) at 144MHz. These selected clusters are in the redshift range 0.78-1.53 (with a median value of 1.05).