A polarized view of the young Pulsar Wind Nebula 3C 58 with IXPE

Abstract

Pulsar Wind nebulae (PWNe), are among the most efficient particle accelerators in the Universe, however understanding the physical conditions and the magnetic geometry in their inner region has always proved elusive. X-ray polarization provides now a unique opportunity to investigate the magnetic field structure and turbulence properties close to where high energy particles are accelerated. Here we report on the recent X-ray polarization measurement of the PWN 3C 58 by the International X-ray Polarimeter Explorer (IXPE). 3C 58 is a young system displaying a characteristic jet-torus structure which, unlike other PWNe, is seen almost edge on. This nebula shows a high level of integrated polarization ~ 22% at an angle ~ 97deg, with an implied magnetic field oriented parallel to the major axis of the inner torus, suggesting a toroidal magnetic geometry with little turbulence in the interior, and an intrinsic level of polarization possibly approaching the theoretical limit for synchrotron emission. No significant detection of a polarized signal from the associated pulsar was found. These results confirm that the internal structure of young PWNe is far less turbulent than previously predicted, and at odds with multidimensional numerical simulations.

9 pages, 7 figures, accepted for publication in A&A

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