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Fluctuating neutron star magnetosphere: braking indices of eight pulsars, frequency second derivatives of 222 pulsars and 15 magnetars
Ou, Z. W.1,2; Tong, H.1; Kou, F. F.1,2; Ding, G. Q.1
2016-04-21
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume457Issue:4Pages:3922-3933
Contribution Rank1
Abstract

Eight pulsars have low braking indices, which challenge the magnetic dipole braking of pulsars. 222 pulsars and 15 magnetars have abnormal distribution of frequency second derivatives, which also make contradiction with classical understanding. How neutron star magnetospheric activities affect these two phenomena are investigated by using the wind braking model of pulsars. It is based on the observational evidence that pulsar timing is correlated with emission and both aspects reflect the magnetospheric activities. Fluctuations are unavoidable for a physical neutron star magnetosphere. Young pulsars have meaningful braking indices, while old pulsars' and magnetars' fluctuation item dominates their frequency second derivatives. It can explain both the braking index and frequency second derivative of pulsars uniformly. The braking indices of eight pulsars are the combined effect of magnetic dipole radiation and particle wind. During the lifetime of a pulsar, its braking index will evolve from three to one. Pulsars with low braking index may put strong constraint on the particle acceleration process in the neutron star magnetosphere. The effect of pulsar death should be considered during the long term rotational evolution of pulsars. An equation like the Langevin equation for Brownian motion was derived for pulsar spin-down. The fluctuation in the neutron star magnetosphere can be either periodic or random, which result in anomalous frequency second derivative and they have similar results. The magnetospheric activities of magnetars are always stronger than those of normal pulsars.

KeywordStars: Magnetars Stars: Neutron Pulsars: General
SubtypeArticle
DOI10.1093/mnras/stw227
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
Language英语
WOS KeywordRotation-powered Pulsar ; X-ray Pulsars ; Psr B1509-58 ; Spin-down ; Radio Observations ; Crab Pulsar ; Vela Pulsar ; Swift J1822.3-1606 ; Torque Variations ; Emission Models
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000373586000038
Funding OrganizationWest Light Foundation of CAS(LHXZ201201) ; 973 Program(2015CB857100) ; Qing Cu Hui of CAS ; NSFC(U1531137)
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/1390
Collection射电天文研究室_脉冲星研究团组
射电天文研究室
110米口径全可动射电望远镜(QTT)_110米大口径全可动射电望远镜关键技术研究(973项目)_课题1:大样本射电天体的观测和前沿问题研究
Affiliation1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China
2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Ou, Z. W.,Tong, H.,Kou, F. F.,et al. Fluctuating neutron star magnetosphere: braking indices of eight pulsars, frequency second derivatives of 222 pulsars and 15 magnetars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,457(4):3922-3933.
APA Ou, Z. W.,Tong, H.,Kou, F. F.,&Ding, G. Q..(2016).Fluctuating neutron star magnetosphere: braking indices of eight pulsars, frequency second derivatives of 222 pulsars and 15 magnetars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,457(4),3922-3933.
MLA Ou, Z. W.,et al."Fluctuating neutron star magnetosphere: braking indices of eight pulsars, frequency second derivatives of 222 pulsars and 15 magnetars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 457.4(2016):3922-3933.
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