Low-frequency Faraday rotation measures towards pulsars using LOFAR: probing the 3D Galactic halo magnetic field

被引：79

作者：

Sobey, C. ^{[1
,2
,3
]}

Bilous, A. V. ^{[4
]}

Griessmeier, J. -M. ^{[5
,6
]}

Hessels, J. W. T. ^{[3
,4
]}

Karastergiou, A. ^{[7
,8
,9
]}

Keane, E. F. ^{[10
]}

Kondratiev, V. I. ^{[3
,11
]}

Kramer, M. ^{[12
]}

Michilli, D. ^{[3
,4
,13
,14
]}

Noutsos, A. ^{[12
]}

Pilia, M. ^{[15
]}

Polzin, E. J. ^{[16
]}

Stappers, B. W. ^{[16
]}

Tan, C. M. ^{[16
]}

van Leeuwen, J. ^{[3
]}

Verbiest, J. P. W. ^{[12
,17
]}

Weltevrede, P. ^{[16
]}

Heald, G. ^{[2
]}

Alves, M. I. R. ^{[18
]}

Carretti, E. ^{[19
]}

Ensslin, T. ^{[20
]}

Haverkorn, M. ^{[18
]}

Iacobelli, M. ^{[3
]}

Reich, W. ^{[12
]}

Van Eck, C. ^{[21
]}

机构：

[1] Curtin Univ, Int Ctr Radio Astron Res, GPO Box U1987, Perth, WA 6845, Australia

[2] CSIRO Astron & Space Sci, POB 1130, Bentley, WA 6102, Australia

[3] Netherlands Inst Radio Astron, ASTRON, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands

[4] Univ Amsterdam, Anton Pannekoek Inst Astron, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

[5] Univ Orleans, CNRS, LPC2E, F-45071 Orleans 2, France

[6] Univ Orleans, CNRS, PSL Res Univ, Stn Radioastronom Nancay,Observ Paris,OSUC, F-18330 Nancay, France

[7] Oxford Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England

[8] Univ Western Cape, Dept Phys & Astron, Private Bag X17, ZA-7535 Bellville, South Africa

[9] Rhodes Univ, Dept Phys & Elect, POB 94, ZA-6140 Grahamstown, South Africa

[10] Jodrell Bank Observ, SKA Org, Macclesfield SK11 9DL, Cheshire, England

[11] Russian Acad Sci, Lebedev Phys Inst, Astro Space Ctr, Profsoyuznaya Str 84-32, Moscow 117997, Russia

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

[13] McGill Univ, Dept Phys, 3600 Univ St, Montreal, PQ H3A 2T8, Canada

[14] McGill Univ, McGill Space Inst, 3550 Univ St, Montreal, PQ H3A 2A7, Canada

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

[16] Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England

[17] Univ Bielefeld, Fak Phys, Postfach 100131, D-33501 Bielefeld, Germany

[18] Radboud Univ Nijmegen, IMAPP, Dept Astrophys, POB 9010, NL-6500 GL Nijmegen, Netherlands

[19] INAF, Ist Radioastron, Via Gobetti 101, I-40129 Bologna, Italy

[20] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85740 Garching, Germany

[21] Univ Toronto, Dunlap Inst Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 484卷 / 03期

基金：

英国科学技术设施理事会; 爱尔兰科学基金会; 欧洲研究理事会;

关键词：

techniques: polarimetric; pulsars: general; ISM: magnetic fields; Galaxy: structure; SYNCHRONOUS X-RAY; VELOCITY VECTORS; COSMIC-RAYS; POLARIZATION; EMISSION; DISCOVERY; PLANE; POLARIMETRY; ALIGNMENT; PROFILES;

D O I：

10.1093/mnras/stz214

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We determined Faraday rotation measures (RMs) towards 137 pulsars in the northern sky, using Low-Frequency Array (LOFAR) observations at 110-190 MHz. This low-frequency RM catalogue, the largest to date, improves the precision of existing RM measurements on average by a factor of 20 - due to the low frequency and wide bandwidth of the data, aided by the RM-synthesis method. We report RMs towards 25 pulsars for the first time. The RMs were corrected for ionospheric Faraday rotation to increase the accuracy of our catalogue to approximate to 0.1 rad m(-2). The ionospheric RM correction is currently the largest contributor to the measurement uncertainty. In addition, we find that the Faraday dispersion functions towards pulsars are extremely Faraday thin - mostly less than 0.001 rad m(-2). We use these new precise RM measurements (in combination with existing RMs, dispersion measures, and distance estimates) to estimate the scale height of the Galactic halo magnetic field: 2.0 +/- 0.3 kpc for Galactic quadrants I and II above and below the Galactic plane (we also evaluate the scale height for these regions individually). Overall, our initial low-frequency catalogue provides valuable information about the 3D structure of the Galactic magnetic field.

引用

页码：3646 / 3664

页数：19

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