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

被引：21

作者：

Abbate, Federico ^{[1
,2
]}

Possenti, Andrea ^{[2
,3
]}

Tiburzi, Caterina ^{[4
,5
]}

Barr, Ewan ^{[4
]}

van Straten, Willem ^{[6
]}

Ridolfi, Alessandro ^{[2
,4
]}

Freire, Paulo ^{[4
]}

机构：

[1] Univ Milano Bicocca, Dipartimento Fis G Occhialini, Milan, Italy

[2] Osservatorio Astron Cagliari, INAF, Selargius, Italy

[3] Univ Cagliari, Dipartimento Fis, Monserrato, Italy

[4] Max Planck Inst Radioastron, Bonn, Germany

[5] Univ Bielefeld, Fak Phys, Bielefeld, Germany

[6] Auckland Univ Technol, Inst Radio Astron & Space Res, Auckland, New Zealand

来源：

NATURE ASTRONOMY | 2020年 / 4卷 / 07期

关键词：

LONG-TERM OBSERVATIONS; ROTATION MEASURES; FARADAY-ROTATION; 47; TUCANAE; PROPER MOTIONS; LINEAR-POLARIZATION; MILLISECOND PULSARS; RADIO; SCALE; MILKY;

D O I：

10.1038/s41550-020-1030-6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 not known whether the Galactic field permeates the halo of the Galaxy. By observing pulsars in the halo globular cluster 47 Tucanae, we have probed the Galactic magnetic field at arcsecond scales, discovering 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 mu G within the globular cluster. Such a scenario supports the existence of a magnetized outflow that extends from the Galactic disk to the halo and interacts with 47 Tucanae. Observations of the Faraday rotation towards pulsars in the halo globular cluster 47 Tucanae have been used to constrain the magnetic field strength in the Galactic halo, finding that it is unexpectedly strong.

引用

页码：704 / +

页数：8

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