出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The origin and evolution of magnetic fields in the Universe is one of the most fascinating and currently
unsolved problems in astrophysics. The existence of kpc-scale fields, in particular, raises
several problems because of the need of amplification mechanisms acting with large efficiency
on large scales. Clusters of galaxies, being the largest systems in the Universe, represent an ideal
laboratory to test theories for the origin of extragalactic magnetic fields. Magnetic fields are investigated
in the radio band from studies of the diffuse synchrotron emission and from the rotation
measure of polarized radio sources. Observations show that cluster fields are at the mG level,
with values up to tens of mG at the center of cooling core clusters. The origin of these magnetic
fields is still debated. The SKA will deliver new data to address currently unaswered questions
about magnetic fields in clusters and map the origin and evolution of magnetized structures in the
Universe.
