A study of multifrequency polarization pulse profiles of millisecond pulsars

被引：128

作者：

Dai, S. ^{[1
,2
,3
]}

Hobbs, G. ^{[3
]}

Manchester, R. N. ^{[3
]}

Kerr, M. ^{[3
]}

Shannon, R. M. ^{[3
]}

van Straten, W. ^{[4
]}

Mata, A. ^{[5
]}

Bailes, M. ^{[4
]}

Bhat, N. D. R. ^{[6
]}

Burke-Spolaor, S. ^{[7
]}

Coles, W. A. ^{[8
]}

Johnston, S. ^{[3
]}

Keith, M. J. ^{[9
]}

Levin, Y. ^{[10
]}

Oslowski, S. ^{[11
,12
]}

Reardon, D. ^{[3
,10
]}

Ravi, V. ^{[13
]}

Sarkissian, J. M. ^{[14
]}

Tiburzi, C. ^{[3
,15
,16
]}

Toomey, L. ^{[3
]}

Wang, H. G. ^{[3
,17
]}

Wang, J. -B. ^{[18
]}

Wen, L. ^{[19
]}

Xu, R. X. ^{[1
,2
,20
]}

Yan, W. M. ^{[18
]}

Zhu, X. -J. ^{[19
]}

机构：

[1] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[2] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[3] CSIRO Astron & Space Sci, Australia Telescope Natl Facil, Epping, NSW 1710, Australia

[4] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia

[5] Univ Texas Brownsville, Ctr Adv Radio Astron, Brownsville, TX 78520 USA

[6] Curtin Univ, Int Ctr Radio Astron Res, Bentley, WA 6102, Australia

[7] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[8] Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA

[9] Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England

[10] Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia

[11] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[12] Univ Bielefeld, Dept Phys, D-33615 Bielefeld, Germany

[13] Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia

[14] CSIRO Astron & Space Sci, Parkes Observ, Parkes, NSW 2870, Australia

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

[16] Univ Cagliari, Dipartimento Fis, I-09042 Monserrato, CA, Italy

[17] Guangzhou Univ, Sch Phys & Elect Engn, Guangzhou 510006, Guangdong, Peoples R China

[18] Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China

[19] Univ Western Australia, Sch Phys, Crawley, WA 6009, Australia

[20] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 449卷 / 03期

基金：

澳大利亚研究理事会; 中国国家自然科学基金;

关键词：

polarization; radiation mechanisms: non-thermal; pulsars: general; radio continuum: general; LARGE-AREA TELESCOPE; MULTICOMPONENT GAUSSIAN FITS; EMPIRICAL-THEORY; FREQUENCY-DEPENDENCE; GEOMETRICAL ANALYSIS; ROTATION MEASURES; FARADAY-ROTATION; RADIO PULSARS; EMISSION; SPECTRA;

D O I：

10.1093/mnras/stv508

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present high signal-to-noise ratio, multifrequency polarization pulse profiles for 24 millisecond pulsars that are being observed as part of the Parkes Pulsar Timing Array project. The pulsars are observed in three bands, centred close to 730, 1400 and 3100 MHz, using a dual-band 10 cm/50 cm receiver and the central beam of the 20-cm multibeam receiver. Observations spanning approximately six years have been carefully calibrated and summed to produce high S/N profiles. This allows us to study the individual profile components and in particular how they evolve with frequency. We also identify previously undetected profile features. For many pulsars we show that pulsed emission extends across almost the entire pulse profile. The pulse component widths and component separations follow a complex evolution with frequency; in some cases these parameters increase and in other cases they decrease with increasing frequency. The evolution with frequency of the polarization properties of the profile is also non-trivial. We provide evidence that the pre- and post-cursors generally have higher fractional linear polarization than the main pulse. We have obtained the spectral index and rotation measure for each pulsar by fitting across all three observing bands. For the majority of pulsars, the spectra follow a single power-law and the position angles follow a lambda(2) relation, as expected. However, clear deviations are seen for some pulsars. We also present phase-resolved measurements of the spectral index, fractional linear polarization and rotation measure. All these properties are shown to vary systematically over the pulse profile.

引用

页码：3223 / 3262

页数：40

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