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Paper detail

Constraints from globular cluster pulsars on the magnetic field in the Galactic halo

The Galactic magnetic field plays an important role in the evolution of the Galaxy, but its small-scale behaviour is still poorly known. It is also unknown whether it permeates the halo of the Galaxy or not. By using observations of pulsars in the halo globular cluster 47 Tucanae, we probed the Galactic magnetic field at arcsecond scales for the first time and discovered an unexpected large gradient in the component of the magnetic field parallel to the line of sight. This gradient is aligned with a direction perpendicular to the Galactic disk and could be explained by magnetic fields amplified to some 60 μG within the globular cluster. This scenario supports the existence of a magnetized outflow that extends from the Galactic disk to the halo and interacts with the studied globular cluster.

preprint2020arXivOpen access
Federico AbbateAndrea PossentiCaterina TiburziEwan BarrWillem van StratenAlessandro RidolfiPaulo Freire
astro-ph.HE
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Federico AbbateAndrea PossentiCaterina TiburziEwan BarrWillem van StratenAlessandro RidolfiPaulo Freire

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