A model for abrupt changes in pulsar pulse profile
文献类型:期刊论文
作者 | Yuen, R.1,2,3; Melrose, D. B.2 |
刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
出版日期 | 2017-08-01 |
卷号 | 469期号:2页码:2049-2058 |
ISSN号 | 0035-8711 |
关键词 | Radiation Mechanisms: Non-thermal Pulsars: General |
DOI | 10.1093/mnras/stx1023 |
产权排序 | 1 |
文献子类 | Article |
英文摘要 | We propose and explore a purely magnetospheric model for observed abrupt changes in pulsar radio profile. The flow rate of the magnetospheric plasma is dependent on the magnetospheric state described by the parameter y. We include the effect of the motion of the visible point along its trajectory, whose omission from a 'standard' version of viewing geometry is strictly valid only for align rotation and approximately valid for oblique rotation only in a narrow range of pulsar phase, which decreases as the obliquity increases. Emission is assumed from spots, distributed uniformly around the magnetic axis, so that observable features, such as subpulses, appear to rotate at a rate, omega(R), relative to the visible point. We find that the apparent motion of an individual spot is not constant, and the apparent distribution of emission spots around the trajectory of the visible point is uneven being highest around the centre of the pulse window, where their apparent motion is slowest, allowing more spots to be present simultaneously in the pulse window than in the 'standard' version. An abrupt ( or more gradual) change in y implies a change in omega(R), which affects the pulse structure and profile. As a case study, we apply the model to 'swooshing' in PSR B0919+06. We discuss correlated slowing down rate in the model and related time-dependent phenomena in radio pulsars. |
URL标识 | 查看原文 |
WOS关键词 | Multicomponent Gaussian Fits ; Drifting Subpulses ; Radio Pulsars ; Diocotron Instability ; Geometrical Analysis ; Neutron-stars ; Psr B0031-07 ; Spin-down ; Polarization ; Radiation |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
WOS记录号 | WOS:000406629100061 |
资助机构 | NSFC(11573059) ; Technology Foundation for Selected Overseas Chinese Scholar, Ministry of Personnel of China ; Joint Funds of NSFC(U1531137) ; Strategic Priority Research Program 'The Emergence of Cosmological Structures' of the Chinese Academy of Sciences(XDB09000000) ; Australian Research Council(DP160102932) |
源URL | [http://ir.xao.ac.cn/handle/45760611-7/1752] |
专题 | 脉冲星研究团组 新疆天文台_射电天文研究室 |
通讯作者 | Yuen, R.; Melrose, D. B. |
作者单位 | 1.Chinese Acad Sci, Key Lab Radio Astron, Urumqi 830011, Xinjiang, Peoples R China 2.Univ Sydney, Sch Phys, SIfA, Sydney, NSW 2006, Australia 3.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China |
推荐引用方式 GB/T 7714 | Yuen, R.,Melrose, D. B.. A model for abrupt changes in pulsar pulse profile[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,469(2):2049-2058. |
APA | Yuen, R.,&Melrose, D. B..(2017).A model for abrupt changes in pulsar pulse profile.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,469(2),2049-2058. |
MLA | Yuen, R.,et al."A model for abrupt changes in pulsar pulse profile".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 469.2(2017):2049-2058. |
入库方式: OAI收割
来源:新疆天文台
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