Rotation Measure synthesis applied on synthetic SKA images of galaxy clusters

Abstract

Future observations with next generation radio telescopes will help us to understand the presence and the evolution of magnetic fields in galaxy clusters through the determination of the so-called Rotation Measure (RM). In this work, we applied the RM-synthesis technique on synthetic SKA1-MID radio images of a pair of merging galaxy clusters, measured between 950 and 1750 MHz with a resolution of 10 arcsec and a thermal noise of 0.1$\mu$Jy/beam. The results of our RM-synthesis analysis are compared to the simulations' input parameters. We study two cases: one with radio haloes at the cluster centres, and another without. We found that the information obtained with the RM-synthesis is in general agreement with the input information. Some discrepancies are however present. We characterise them in this work, with the final goal of determining the potential impact of SKA1-MID on the study of cluster magnetic fields.

17 pages, 17 figures

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• Particle re-acceleration and diffuse radio sources in the galaxy cluster Abell 1550
• The thermal and non-thermal components within and between galaxy clusters Abell 399 and Abell 401
• Puzzling large-scale polarization in the galaxy cluster Abell 523
• Message in a Bottle: Unveiling the Magneto-Ionic Complexity of AGNs through the Stokes QU-Fitting Technique
• A depolarizing HI tidal tail in the western lobe of Fornax A
• Spectral study of the diffuse synchrotron source in the galaxy cluster Abell 523
• Filaments in and between galaxy clusters at low and mid-frequency with the SKA telescope
• Numerical modelling of the lobes of radio galaxies VI. Polarimetric simulations of universal pressure profile cluster atmospheres