| Can the inner gap sparking take place in millisecond pulsars？ |
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| 作者姓名： | Hong-Guang Wang Guo-Jun Qiao and Ren-Xin Xu |
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| 作者单位： | Hong-Guang Wang，Guo-Jun Qiao and Ren-Xin Xu
Department of Astronomy，Peking University，Beijing 100871; |
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| 基金项目： | Supported by the National Natural Science Foundation of China |
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| 摘 要： | The inner vacuum gap model has become the foundation stone of most theories on pulsar radio emission. The fundamental picture of this model is the sparking, which was conjectured to be induced by magnetic absorption of background gamma photons. However, a question is, can the sparking be triggered in the millisecond pulsars (MSPs) with magnetic fields (B) only about 108 G? We investigate this problem by including the pair production above the inner gap. Under the assumption that the magnetic field is dipolar, our results show the background gamma-ray emission can not be the key factor that triggers the sparking, at least not in MSPs with B - 108 G, if the temperature in the polar cap region is only so high as is observed (< 4 × 106 K). Some other mechanisms are required.
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| 关 键 词： | 脉冲星 恒星物理学 γ射线 磁性 内部间隙 |
Can the inner gap sparking take place in millisecond pulsars? |
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| Hong-Guang Wang,Guo-Jun Qiao and Ren-Xin Xu.Can the inner gap sparking take place in millisecond pulsars?[J].Chinese Journal of Astronomy and Astrophysics,2003,3(5):443-452. |
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| Authors: | Hong-Guang Wang Guo-Jun Qiao Ren-Xin Xu |
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| Abstract: | The inner vacuum gap model has become the foundation stone of most theories on pulsar radio emission. The fundamental picture of this model is the sparking, which was conjectured to be induced by magnetic absorption of background gamma photons. However, a question is, can the sparking be triggered in the millisecond pulsars (MSPs) with magnetic fields (B) only about 10s G? We investigate this problem by including the pair production above the inner gap. Under the assumption that the magnetic field is dipolar, our results show the background gamma-ray emission can not be the key factor that triggers the sparking, at least not in MSPs with B ～ 108 G, if the temperature in the polar cap region is only so high as is observed (＜ 4 × 106 K). Some other mechanisms are required. |
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| Keywords: | pulsar: general-gamma rays-magnetic fields |
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