Radio Pulsar B0950+08: Radiation in the Magnetosphere and Sparks above the Surface
We observed the nearby radio pulsar B0950+08, which has a 100% duty cycle, using the Five-hundred-meter Aperture Spherical Radio Telescope. We obtained the polarization profile for its entire rotation, which enabled us to investigate its magnetospheric radiation geometry and the sparking pattern of...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad217a |
| _version_ | 1797290724123738112 |
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| author | Zhengli Wang Jiguang Lu Jinchen Jiang Shunshun Cao Kejia Lee Enwei Liang Lunhua Shang Weiyang Wang Renxin Xu Weiwei Zhu |
| author_facet | Zhengli Wang Jiguang Lu Jinchen Jiang Shunshun Cao Kejia Lee Enwei Liang Lunhua Shang Weiyang Wang Renxin Xu Weiwei Zhu |
| author_sort | Zhengli Wang |
| collection | DOAJ |
| description | We observed the nearby radio pulsar B0950+08, which has a 100% duty cycle, using the Five-hundred-meter Aperture Spherical Radio Telescope. We obtained the polarization profile for its entire rotation, which enabled us to investigate its magnetospheric radiation geometry and the sparking pattern of the polar cap. After we excluded part of the profile in which the linear polarization factor is low (≲30%) and potentially contaminated by jumps in position angle, the rest of the swing in polarization position angle fits a classical rotating vector model (RVM) well. The best-fit RVM indicates that the inclination angle, α , and the impact angle, β , of this pulsar, are 100.°5 and −33.°2, respectively, suggesting that the radio emission comes from two poles. We find that, in such RVM geometry, either the annular vacuum gap model or the core vacuum gap model would require that the radio emissions come from a high-altitude magnetosphere with heights from ∼0.25 R _LC to ∼0.56 R _LC , with R _LC being the light cylinder radius. Both the main and interpulses’ sparking points are located away from the magnetic pole, which could relate to the physical conditions on the pulsar surface. |
| first_indexed | 2024-03-07T19:26:42Z |
| format | Article |
| id | doaj.art-31626796485f4c0ba2d383a581a39609 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-07T19:26:42Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-31626796485f4c0ba2d383a581a396092024-02-29T09:36:07ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0196316510.3847/1538-4357/ad217aRadio Pulsar B0950+08: Radiation in the Magnetosphere and Sparks above the SurfaceZhengli Wang0Jiguang Lu1Jinchen Jiang2https://orcid.org/0000-0002-6465-0091Shunshun Cao3https://orcid.org/0009-0007-3817-8188Kejia Lee4Enwei Liang5https://orcid.org/0000-0002-7044-733XLunhua Shang6https://orcid.org/0000-0002-9173-4573Weiyang Wang7https://orcid.org/0000-0001-9036-8543Renxin Xu8https://orcid.org/0000-0002-9042-3044Weiwei Zhu9https://orcid.org/0000-0001-5105-4058Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University , Nanning 530004, People's Republic of China ; lew@gxu.edu.cnNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China ; lujig@nao.cas.cn; Guizhou Radio Astronomical Observatory , Guiyang 550025, People's Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China ; lujig@nao.cas.cnDepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People's Republic of ChinaDepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People's Republic of China; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People's Republic of ChinaGuangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University , Nanning 530004, People's Republic of China ; lew@gxu.edu.cnGuizhou Normal University , Guiyang 550025, People's Republic of ChinaSchool of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China; National Astronomical Observatories, Chinese Academy of Sciences , Jia-20 Datun Road, ChaoYang District, Beijing 100101, People's Republic of ChinaDepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People's Republic of China; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People's Republic of China; State Key Laboratory of Nuclear Physics and Technology, Peking University , Beijing 100871, People's Republic of ChinaNational Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China ; lujig@nao.cas.cnWe observed the nearby radio pulsar B0950+08, which has a 100% duty cycle, using the Five-hundred-meter Aperture Spherical Radio Telescope. We obtained the polarization profile for its entire rotation, which enabled us to investigate its magnetospheric radiation geometry and the sparking pattern of the polar cap. After we excluded part of the profile in which the linear polarization factor is low (≲30%) and potentially contaminated by jumps in position angle, the rest of the swing in polarization position angle fits a classical rotating vector model (RVM) well. The best-fit RVM indicates that the inclination angle, α , and the impact angle, β , of this pulsar, are 100.°5 and −33.°2, respectively, suggesting that the radio emission comes from two poles. We find that, in such RVM geometry, either the annular vacuum gap model or the core vacuum gap model would require that the radio emissions come from a high-altitude magnetosphere with heights from ∼0.25 R _LC to ∼0.56 R _LC , with R _LC being the light cylinder radius. Both the main and interpulses’ sparking points are located away from the magnetic pole, which could relate to the physical conditions on the pulsar surface.https://doi.org/10.3847/1538-4357/ad217aRadio pulsarsMagnetospheric radio emissions |
| spellingShingle | Zhengli Wang Jiguang Lu Jinchen Jiang Shunshun Cao Kejia Lee Enwei Liang Lunhua Shang Weiyang Wang Renxin Xu Weiwei Zhu Radio Pulsar B0950+08: Radiation in the Magnetosphere and Sparks above the Surface The Astrophysical Journal Radio pulsars Magnetospheric radio emissions |
| title | Radio Pulsar B0950+08: Radiation in the Magnetosphere and Sparks above the Surface |
| title_full | Radio Pulsar B0950+08: Radiation in the Magnetosphere and Sparks above the Surface |
| title_fullStr | Radio Pulsar B0950+08: Radiation in the Magnetosphere and Sparks above the Surface |
| title_full_unstemmed | Radio Pulsar B0950+08: Radiation in the Magnetosphere and Sparks above the Surface |
| title_short | Radio Pulsar B0950+08: Radiation in the Magnetosphere and Sparks above the Surface |
| title_sort | radio pulsar b0950 08 radiation in the magnetosphere and sparks above the surface |
| topic | Radio pulsars Magnetospheric radio emissions |
| url | https://doi.org/10.3847/1538-4357/ad217a |
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