Simulation for Distributions of Several Geometric Parameters in Nulling Pulsars
文献类型：期刊论文
| 作者 | Han, X. H.3 ; Yuen, R.1,2,3
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2022-12-01 |
| 卷号 | 940期号:2页码:9 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ac98b5 |
| 通讯作者 | Yuen, R.(ryuen@xao.ac.cn) |
| 英文摘要 | We investigate the distributions of the obliquity angle and impact parameters of nulling pulsars of different duty cycles based on the simulation of more than 600,000 samples. We adopt a purely geometric approach for pulsar visibility, in which visible emission is emitted tangentially to the magnetic field line and parallel to the line-of-sight direction. The geometry is incorporated with the model for pulsar magnetospheres of multiple emission states, in which the plasma charge density is dependent on the emission state. We assume that an emission state can only exist between two limiting conditions described by the vacuum and corotation models, respectively. In this model, pulse nulling corresponds to emission switching to a state in which the plasma charge density is zero. The event is detectable only if the switching occurs at source points that lie on a trajectory, whose locus defines the locations of visible emission, within an open-field region. Our results show that detectable nulling is dependent on all three parameters, such that nulling pulsars prefer a small obliquity angle and duty cycle, and tend to have positive impact parameters. We find that the total population of nulling pulsars in our samples is around 23%, of which about 47% possess a duty cycle of 0.1 or smaller. The former implies that there are more nulling pulsars than currently known. Our model predicts that the number of nulling pulsars increases as the obliquity angle decreases, which also implies that the occurrence of nulling in a pulsar should evolve over time. |
| WOS关键词 | RADIO-EMISSION ALTITUDE ; EMPIRICAL-THEORY ; INTENSITY MEASUREMENTS ; DRIFTING SUBPULSES ; WIDTH STATISTICS ; POLARIZATION |
| 资助项目 | Key Laboratory of Xinjiang Uygur Autonomous Region[2020D04049] ; National SKA Program of China[2020SKA0120200] ; Natural Science Foundation of China[12041304] ; Natural Science Foundation of China[U1838109] ; Natural Science Foundation of China[11873080] ; Natural Science Foundation of China[12041301] ; 2018 Project of Xinjiang Uygur Autonomous Region of China for Flexibly Fetching in Upscale Talents ; Xiaofeng Yang's Xinjiang Tianchi Bairen project ; CAS Pioneer Hundred Talents Program |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP Publishing Ltd |
| WOS记录号 | WOS:000890351500001 |
| 资助机构 | Key Laboratory of Xinjiang Uygur Autonomous Region ; National SKA Program of China ; Natural Science Foundation of China ; 2018 Project of Xinjiang Uygur Autonomous Region of China for Flexibly Fetching in Upscale Talents ; Xiaofeng Yang's Xinjiang Tianchi Bairen project ; CAS Pioneer Hundred Talents Program |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/4974]  |
| 专题 | 脉冲星研究团组 |
| 通讯作者 | Yuen, R. |
| 作者单位 | 1.Univ Sydney, Sch Phys, SIfA, Sydney, NSW 2006, Australia 2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China 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 | Han, X. H.,Yuen, R.. Simulation for Distributions of Several Geometric Parameters in Nulling Pulsars[J]. ASTROPHYSICAL JOURNAL,2022,940(2):9. |
| APA | Han, X. H.,&Yuen, R..(2022).Simulation for Distributions of Several Geometric Parameters in Nulling Pulsars.ASTROPHYSICAL JOURNAL,940(2),9. |
| MLA | Han, X. H.,et al."Simulation for Distributions of Several Geometric Parameters in Nulling Pulsars".ASTROPHYSICAL JOURNAL 940.2(2022):9. |
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