A MeerKAT look at the polarization of 47 Tucanae pulsars: magnetic field implications

被引：7

作者：

Abbate, F. ^{[1
]}

Possenti, A. ^{[2
,3
]}

Ridolfi, A. ^{[1
,2
]}

Venkatraman Krishnan, V. ^{[1
]}

Buchner, S. ^{[4
]}

Barr, E. D. ^{[1
]}

Bailes, M. ^{[5
]}

Kramer, M. ^{[1
,7
]}

Cameron, A. ^{[5
,6
]}

Parthasarathy, A. ^{[1
]}

van Straten, W. ^{[8
]}

Chen, W. ^{[1
]}

Camilo, F. ^{[4
]}

Padmanabh, P., V ^{[1
,9
]}

Mao, S. A. ^{[1
]}

Freire, P. C. C. ^{[1
]}

Ransom, S. M. ^{[10
]}

Vleeschower, L.

Geyer, M. ^{[4
]}

Zhang, L. ^{[11
]}

机构：

[1] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany

[2] INAF Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy

[3] Univ Cagliari, Dept Phys, SP Monserrato Sestu Km 0700, I-09042 Monserrato, Italy

[4] South African Radio Astron Observ, 2 Fir St, ZA-7925 Cape Town, South Africa

[5] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Mail H39,POB 218, Melbourne, Vic 3122, Australia

[6] Swinburne Univ Technol, ARC Ctr Excellence Gravitat Wave Discovery OzGrav, Mail H11,POB 218, Melbourne, Vic 3122, Australia

[7] Univ Manchester, Jodrell Bank Ctr Astrophys, Dept Phys & Astron, Manchester M13 9PL, England

[8] Auckland Univ Technol, Inst Radio Astron & Space Res, Private Bag 92006, Auckland 1142, New Zealand

[9] Albert Einstein Inst, Max Planck Inst Gravitat Phys, D-30167 Hannover, Germany

[10] Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA

[11] Chinese Acad Sci, Natl Astron Observ, A20 Datun Rd, Beijing 100101, Peoples R China

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 518卷 / 02期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

(Galaxy:) globular clusters: individual: 47 Tucanae; magnetic fields; polarization; GALACTIC GLOBULAR-CLUSTERS; LONG-TERM OBSERVATIONS; ROTATION MEASURES; MILKY-WAY; MASS-LOSS; TURBULENCE; DENSITY; PARKES; MODELS; SCALE;

D O I：

10.1093/mnras/stac3248

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the polarization profiles of 22 pulsars in the globular cluster 47 Tucanae using observations from the MeerKAT radio telescope at UHF band (544-1088 MHz) and report precise values of dispersion measure (DM) and rotation measure (RM). We use these measurements to investigate the presence of turbulence in electron density and magnetic fields. The structure function of DM shows a break at similar to 30 arcsec (similar to 0.6 pc at the distance of 47 Tucanae) that suggests the presence of turbulence in the gas in the cluster driven by the motion of wind-shedding stars. On the other hand, the structure function of RM does not show evidence of a break. This non-detection could be explained either by the limited number of pulsars or by the effects of the intervening gas in the Galaxy along the line of sight. Future pulsar discoveries in the cluster could help confirm the presence and localize the turbulence.

引用

页码：1642 / 1655

页数：14

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