The Spiderweb proto-cluster is being magnetized by its central radio jet
Craig S. Anderson, Christopher L. Carilli, Paolo Tozzi, G. K. Miley,, S. Borgani, Tracy Clarke, L. Di Mascolo, Ang Liu, Tony Mroczkowski, Maurilio, Pannella, L Pentericci, H.J.A. Rottgering, A. Saro

TL;DR
This study provides detailed polarimetric maps of a high-redshift radio galaxy, revealing coherent magnetic fields and jet-gas interactions, suggesting active magnetization of its proto-cluster environment and implications for cosmic magnetic field evolution.
Contribution
It presents the most detailed high-redshift radio galaxy polarization maps, revealing magnetic field structures and jet interactions, advancing understanding of cosmic magnetization processes.
Findings
Coherent magnetic fields span the 60 kpc jets.
Large-scale RM gradient indicates a toroidal magnetic field component.
Magnetic field strength decreases from hotspots to ambient medium.
Abstract
We present deep broadband radio polarization observations of the Spiderweb radio galaxy (J1140-2629) in a galaxy proto-cluster at . These yield the most detailed polarimetric maps yet made of a high redshift radio galaxy. The intrinsic polarization angles and Faraday Rotation Measures (RMs) reveal coherent magnetic fields spanning the kpc length of the jets, while % fractional polarizations indicate these fields are well-ordered. Source-frame absolute RM values of rad/m/m are typical, and values up to rad/m/m are observed. The Faraday-rotating gas cannot be well-mixed with the synchrotron-emitting gas, or stronger-than-observed depolarization would occur. Nevertheless, an observed spatial coincidence between a localized absolute RM enhancement of rad/m/m, a bright knot of Ly emission, and a deviation of the radio jet…
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