Speaker
Description
Magnetic fields have been detected so far through Faraday rotation in individual galaxy clusters and in stacked cosmic filaments; however, a direct measurement in individual filaments remains challenging. In this talk, I present the first attempt to constrain the magnetic field in the ∼13 Mpc inter-cluster filament connecting Abell 3667 and Abell 3651 (z ∼ 0.06), recently detected in X-rays by eROSITA. Using the Polarisation Sky Survey of the Universe’s Magnetism (POSSUM) performed with ASKAP, I analysed the Rotation Measure scatter of background polarised sources across the filament region. Our results suggest a marginal detection of the filament, leading to an upper limit to its magnetic field strength. While current data do not allow a firm detection, these results provide the first Faraday-based constraint on magnetic fields in an inter-cluster bridge, in line with theoretical predictions. Moreover, I will discuss how the upcoming SKA will revolutionise this type of study, enabling robust measurements of magnetic fields in the cosmic web with unprecedented sensitivity and resolution.
| Topics | Galaxy Clusters & LSS (relativistic particles and magnetic fields) |
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