The detection of cluster magnetic fields via radio source depolarisation

It has been well established that galaxy clusters have magnetic fields. The exact properties and origin of these fields are still uncertain even though play a key role in many astrophysical processes. Various attempts made to derive the field strength structure nearby using Faraday rotation extended cluster radio sources. This approach needs make various assumptions could be circumvented when background However, because number polarised sources behind is low, at moment such study can only done statistically. In this paper, we investigate depolarisation inside sample 124 massive z < 0.35 observed with Karl G. Jansky Very Large Array. We detect clear trend impact parameter, smaller projected distances centre showing more depolarisation. By combining observations ancillary X-ray data from Chandra , compare expectations models individual density profiles. best-fitting central 5−10 μG power-law indices between n = 1 4. find no strong difference embedded located similar radii, although region poorly probed by also examine as function dynamical state, mass, redshift. see hint dynamically disturbed show than relaxed r > 0.2 R 500 region. core region, did not observe enough significant cool-core non-cool-core clusters. Our findings statistical good probe parameters. Cluster members used for purpose local interaction galaxies intracluster medium does strongly affect trend.