Properties of the emission region in pulsars with opposite subpulse drift directions in different profile components
文献类型：期刊论文
| 作者 | Tedila, H. M.3,4,5; Yuen, R.1,2,5 ; Han, X. H.5
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| 刊名 | ASTROPHYSICS AND SPACE SCIENCE
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| 出版日期 | 2021-10-01 |
| 卷号 | 366期号:10页码:11 |
| ISSN号 | 0004-640X |
| 关键词 | Pulsars: general Stars: neutron Radiation mechanisms: non-thermal |
| DOI | 10.1007/s10509-021-04007-4 |
| 通讯作者 | Yuen, R.(ryuen@xao.ac.cn) |
| 英文摘要 | We investigate properties of the emission region as revealed by drifting subpulses of opposite drift directions at different parts of a pulse profile by using the rotating carousel model in an obliquely rotating pulsar magnetosphere of multiple emission states. Subpulse emission is assumed coming from m discrete emission areas that are distributed around the magnetic axis on a rotating carousel. The flow rate of the emission areas is determined by the E x B drift in an emission state, designated by the parameter y, in which E and the associated flow rate are dependent on y. In this model, subpulses appear to drift in an emission state if a relative speed exists between the plasma flow and corotation, and the diversity in the drift rates and directions corresponds to the relative speed being different in different parts of a profile. We apply the model to three pulsars that exhibit drifting subpulses of opposite drift directions to identify the emission states and the values of m. Our results show that different drifting subpulses correspond to particular values of m and y, and the latter implies that different emission states can coexist and operate concurrently in an emission region. We find that m does not show clear dependency on either the obliquity angle or emission state. We demonstrate that subpulse arrangement may vary across an emission region meaning that it is not always uniform on a carousel. We discuss drifting subpulses of opposite drift directions and subpulse drift-rate switching in terms of different emission states in our model, and speculate that they may be two manifestations of the same underlying mechanism. |
| WOS关键词 | FREQUENCY-DEPENDENCE ; RADIO ; MODULATION ; POLARIZATION ; ALTITUDE ; SHAPE |
| 资助项目 | Xinjiang Uygur Autonomous Region of China ; Natural Science Foundation of China[U1838109] ; Natural Science Foundation of China[11873080] ; Natural Science Foundation of China[12041301] ; CAS Pioneer Hundred Talents Program ; Xiaofeng Yang's Xinjiang Tianchi Bairen project |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | SPRINGER |
| WOS记录号 | WOS:000712285100002 |
| 资助机构 | Xinjiang Uygur Autonomous Region of China ; Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program ; Xiaofeng Yang's Xinjiang Tianchi Bairen project |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/4339]  |
| 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, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 3.Arba Minch Univ, Arba Minch 21, Ethiopia 4.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 5.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 | Tedila, H. M.,Yuen, R.,Han, X. H.. Properties of the emission region in pulsars with opposite subpulse drift directions in different profile components[J]. ASTROPHYSICS AND SPACE SCIENCE,2021,366(10):11. |
| APA | Tedila, H. M.,Yuen, R.,&Han, X. H..(2021).Properties of the emission region in pulsars with opposite subpulse drift directions in different profile components.ASTROPHYSICS AND SPACE SCIENCE,366(10),11. |
| MLA | Tedila, H. M.,et al."Properties of the emission region in pulsars with opposite subpulse drift directions in different profile components".ASTROPHYSICS AND SPACE SCIENCE 366.10(2021):11. |
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来源：新疆天文台
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