| Spectral Properties of Anomalous X-ray Pulsars |
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| 作者姓名： | Ye Lu Wei Wang and Yong-Heng Zhao
National Astronomical Observatories Chinese Academy of Sciences Beijing |
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| 作者单位： | Ye Lu，Wei Wang and Yong-Heng Zhao
National Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012; |
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| 基金项目： | Supported by the National Natural Science Foundation of China |
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| 摘 要： | We examine the spectra of the persistent emission from anomalous X-ray pulsars (AXPs) and their variati on with the spin-down rate Ω. Based onan accretion-powered model, the influences of both the magnetic field and the mass accretion rate on the spectral properties of AXPs are addressed. We then investigate the relation between the spectral property of AXPs and mass accretion rate M. The result shows that there exists a linear correlation between the photon index and the mass accretion rate: the spectral hardness increases with increasing M. A possible emission mechanism for the explanation of the spectral properties of AXPs is also discussed.
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| 关 键 词： | 光谱 X射线 脉冲星 模型 |
Spectral Properties of Anomalous X-ray Pulsars |
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| Ye Lu,Wei Wang and Yong-Heng Zhao
National Astronomical Observatories,Chinese Academy of Sciences,Beijing ,.Spectral Properties of Anomalous X-ray Pulsars[J].Chinese Journal of Astronomy and Astrophysics,2003,3(6):543-550. |
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| Authors: | YE Lu Wei Wang Yong-Heng Zhao |
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| Institution: | NationalAstronomicalObservatories,ChineseAcademyofSciences,Beijing100012; |
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| Abstract: | We examine the spectra of the persistent emission from anomalous X-ray pulsars (AXPs) and their variation with the spin-down rate Ω. Based on an accretion-powered model, the influences of both the magnetic field and the mass accretion rate on the spectral properties of AXPs are addressed. We then investigate the relation between the spectral property of AXPs and mass accretion rate M. The result shows that there exists a linear correlation between the photon index and the mass accretion rate: the spectral hardness increases with increasing M. A possible emission mechanism for the explanation of the spectral properties of AXPs is also discussed. |
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| Keywords: | pulsars: general - stars: neutron - X-rays: stars - accretion: accre-tion disks |
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