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
收藏
页码：704 / +
页数：8
相关论文
共 57 条
[1]   Internal gas models and central black hole in 47 Tucanae using millisecond pulsars [J].
Abbate, F. ;
Possenti, A. ;
Ridolfi, A. ;
Freire, P. C. C. ;
Camilo, F. ;
Manchester, R. N. ;
D'Amico, N. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2018, 481 (01) :627-638
[2]   ELECTRON-DENSITY POWER SPECTRUM IN THE LOCAL INTERSTELLAR-MEDIUM [J].
ARMSTRONG, JW ;
RICKETT, BJ ;
SPANGLER, SR .
ASTROPHYSICAL JOURNAL, 1995, 443 (01) :209-221
[3]  
Bailes M., 2016, MeerKAT Science: On the Pathway to the SKA, P11
[4]   Mean proper motions, space orbits, and velocity dispersion profiles of Galactic globular clusters derived from Gaia DR2 data [J].
Baumgardt, H. ;
Hilker, M. ;
Sollima, A. ;
Bellini, A. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2019, 482 (04) :5138-5155
[5]   Faraday rotation measure synthesis [J].
Brentjens, MA ;
de Bruyn, AG .
ASTRONOMY & ASTROPHYSICS, 2005, 441 (03) :1217-U100
[6]   Observations of 20 millisecond pulsars in 47 Tucanae at 20 centimeters [J].
Camilo, F ;
Lorimer, DR ;
Freire, P ;
Lyne, AG ;
Manchester, RN .
ASTROPHYSICAL JOURNAL, 2000, 535 (02) :975-990
[7]   Giant magnetized outflows from the centre of the Milky Way [J].
Carretti, Ettore ;
Crocker, Roland M. ;
Staveley-Smith, Lister ;
Haverkorn, Marijke ;
Purcell, Cormac ;
Gaensler, B. M. ;
Bernardi, Gianni ;
Kesteven, Michael J. ;
Poppi, Sergio .
NATURE, 2013, 493 (7430) :66-69
[8]  
Chiuderi C., 2015, Basics of Plasma Astrophysics
[9]   A study of multifrequency polarization pulse profiles of millisecond pulsars [J].
Dai, S. ;
Hobbs, G. ;
Manchester, R. N. ;
Kerr, M. ;
Shannon, R. M. ;
van Straten, W. ;
Mata, A. ;
Bailes, M. ;
Bhat, N. D. R. ;
Burke-Spolaor, S. ;
Coles, W. A. ;
Johnston, S. ;
Keith, M. J. ;
Levin, Y. ;
Oslowski, S. ;
Reardon, D. ;
Ravi, V. ;
Sarkissian, J. M. ;
Tiburzi, C. ;
Toomey, L. ;
Wang, H. G. ;
Wang, J. -B. ;
Wen, L. ;
Xu, R. X. ;
Yan, W. M. ;
Zhu, X. -J. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015, 449 (03) :3223-3262
[10]   Emission beam geometry of selected pulsars derived from average pulse polarization data [J].
Everett, JE ;
Weisberg, JM .
ASTROPHYSICAL JOURNAL, 2001, 553 (01) :341-357
123456