| More Emission Cones: Multi-frequency Simulation of the Pulse Profiles of PSR J0437-4715 |
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| 作者姓名： | Guo-Jun Qiao Xu-Dong Wang Hong-Guang Wang and Ren-Xin Xu |
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| 作者单位： | Guo-Jun Qiao，Xu-Dong Wang，Hong-Guang Wang and Ren-Xin XuDepartment of Astronomy and CAS-PKU Joint Beijing Astrophysics Center，Peking University，Beijing 100871 |
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| 基金项目： | 国家自然科学基金，the Research Fund for the Doctoral Program Higher Education |
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| 摘 要： | Pulsar radio emission beams have been studied observationally for a long time, and the suggestion is that they consist of the so-called core and conal components. To reproduce these components is a challenge for any emission model, and that the pulse profile of pulsars changes with frequency presents even a greater challenge. Assuming a local surface magnetic structure (to produce the core or central beam) and a global dipole magnetic field (to produce the conal beams), Gil & Krawczyk (1997) applied curvature radiation to the pulse profile simulation of PSR J0437-4715 (hereafter the GK model). Here we present an alternative multi-frequency simulation of the same profiles within the framework of the Inverse Compton Scattering (ICS) model. It is obtained from our simulation (1) that besides the core, the inner cone and the outer cone, there is an outer-outer cone; (2) that the emission components of the core and cones evolve strongly with frequency. Some important differences between the ICS model and the
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More Emission Cones: Multi-frequency Simulation of the Pulse Profiles of PSR J0437-4715 |
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| Guo-Jun Qiao,Xu-Dong Wang,Hong-Guang Wang and Ren-Xin Xu.More Emission Cones: Multi-frequency Simulation of the Pulse Profiles of PSR J0437-4715[J].Chinese Journal of Astronomy and Astrophysics,2002,2(4). |
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| Authors: | Guo-Jun Qiao Xu-Dong Wang Hong-Guang Wang Ren-Xin Xu |
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| Abstract: | Pulsar radio emission beams have been studied observationally for a long time, and the suggestion is that they consist of the so-called core and conal components. To reproduce these components is a challenge for any emission model, and that the pulse profile of pulsars changes with frequency presents even a greater challenge. Assuming a local surface magnetic structure (to produce the core or central beam) and a global dipole magnetic field (to produce the conal beams), Gil & Krawczyk (1997) applied curvature radiation to the pulse profile simulation of PSR J0437-4715 (hereafter the GK model). Here we present an alternative multi-frequency simulation of the same profiles within the framework of the Inverse Compton Scattering (ICS) model. It is obtained from our simulation (1) that besides the core, the inner cone and the outer cone, there is an outer-outer cone; (2) that the emission components of the core and cones evolve strongly with frequency. Some important differences between the ICS model and the GK model are discussed, which need to be tested by further observations. |
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| Keywords: | pulsar: general - radiation mechanisms: ICS - pulsar: individual (PSR J0437-4715) |
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