A Revisit of the Phase-resolved X-Ray and Gamma-Ray Spectra of the Crab Pulsar
A Revisit of the Phase-resolved X-Ray and Gamma-Ray Spectra of the Crab Pulsar
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DOI：
10.1086/527029
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发表时间：
2007-11
期刊：
影响因子：
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通讯作者：
A. Tang;J. Takata;J. Jia;K. Cheng
中科院分区：
文献类型：
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作者：
A. Tang;J. Takata;J. Jia;K. Cheng
本文采用一种改进的外能隙模型研究了蟹状星云脉冲星的多频相位分辨谱。来自两极的发射有助于光变曲线和相位分辨光谱。利用同步辐射自康普顿机制并考虑曲率光子向次级对的不完全转换，可以很好地解释100 eV ~ 10 GeV范围内观测到的相位平均谱。预测的相位分辨光谱可以匹配观测数据相当好，太。我们发现北极的辐射主要贡献于前缘翼1。其余阶段的排放主要由南极主导。外部间隙的方位延伸的加宽解释了尾翼2。复杂的相位分辨光谱的两个峰值之间的阶段，即，尾翼1，桥梁，和领先的机翼2，强烈建议，有至少两个良好分离的发射区域与多种发射机制同步辐射，逆康普顿散射，曲率辐射。我们的最佳拟合结果表明，在南极和北极之间可能存在一些不对称性。我们的模型预测可以用GLAST来检验。
We use a modified outer-gap model to study the multifrequency phase-resolved spectra of the Crab pulsar. The emissions from both poles contribute to the light curve and the phase-resolved spectra. Using the synchrotron self-Compton mechanism and by considering the incomplete conversion of curvature photons into secondary pairs, the observed phase-averaged spectrum from 100 eV to 10 GeV can be explained very well. The predicted phase-resolved spectra can match the observed data reasonably well, too. We find that the emission from the north pole mainly contributes to leading wing 1. The emissions in the remaining phases are mainly dominated by the south pole. The widening of the azimuthal extension of the outer gap explains trailing wing 2. The complicated phase-resolved spectra for the phases between the two peaks, namely, trailing wing 1, the bridge, and leading wing 2, strongly suggest that there are at least two well-separated emission regions with multiple emission mechanisms—synchrotron radiation, inverse Compton scattering, and curvature radiation. Our best-fit results indicate that there may exist some asymmetry between the south and north poles. Our model predictions can be examined with GLAST.