Spectral Modeling of the High-Energy Emission of the Magnetar 4U 0142+614
Spectral Modeling of the High-Energy Emission of the Magnetar 4U 0142+614
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Magnetar 4U 0142 614 高能发射的光谱建模
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Riccardo Campana
中科院分区：
文献类型：
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作者：
N. Rea;R. Turolla;S. Zane;A. Tramacere;L. Stella;G. Israel;Riccardo Campana
基于X射线和γ射线能量的同步Swift和INTEGRAL观测，提出了异常X射线脉冲星4U 0142+614高能辐射的经验谱模型。我们采用了包含在XSPEC分析包中的模型，以及基于最近理论研究的模型，并将自己限制在最多三个组件的组合中，这些组件可以产生良好的拟合，同时需要最少数量的自由参数。只有三个模型能满意地拟合4U 0142+614的0.5-250 keV谱：（1）~0.4 keV黑体和两个幂律，（2）共振回旋散射模型加一个幂律，（3）两个对数抛物线函数。我们发现，只有后两个模型没有过度预测同时从这个AXP观测到的红外/光学发射，只有对数抛物线函数可以自然地解释COMPTEL在γ射线范围内设定的上限。讨论了高能粒子对软X射线光子逆康普顿散射的两个对数抛物线的可能解释。
We present an empirical spectral modeling of the high-energy emission of the anomalous X-ray pulsar 4U 0142+614 based on simultaneous Swift and INTEGRAL observations from X- to γ-ray energies. We adopted models contained in the XSPEC analysis package, as well as models based on recent theoretical studies, and restricted ourselves to those combinations of up to three components that produced a good fit while requiring the lowest number of free parameters. Only three models were found to satisfactorily fit the 0.5-250 keV spectrum of 4U 0142+614: (1) a ~0.4 keV blackbody and two power laws, (2) a resonant cyclotron scattering model plus a power law, and (3) two log-parabolic functions. We found that only the latter two models do not overpredict the infrared/optical emission observed simultaneously from this AXP, and only the log-parabolic functions can naturally account for the upper limits set by COMPTEL in the γ-ray range. A possible interpretation of the two log parabolae in terms of inverse Compton scattering of soft X-ray photons by very energetic particles is discussed.