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arXiv 0804.0435astro-ph
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反常X射线脉冲星非热X射线尾辐射的数值模拟

Modeling the Non-Thermal X-ray Tail Emission of Anomalous X-ray Pulsars

Matthew G. Baring, Alice K. Harding

摘要:

随着INTEGRAL和RXTE在三颗反常X射线脉冲星中发现了平坦、坚硬的X射线成分,反常X射线脉冲星的研究范式发生了变化。这些非热谱成分与在这些源的经典X射线波段中看到的更陡峭的准幂律尾有很大不同,自然可以归因于磁层的活动。共振,磁康普顿上散射是一个候选机制,产生这种新的组件,因为它是非常有效的强场附近的AXP表面。本文采用动力学方程和QED磁散射截面,给出了AXP表面热X射线上散射的内磁层模型结果。特征平坦和强偏振的发射光谱是由注入发射区的非热电子产生的。光谱结果强烈依赖于观测者的方向和磁层的散射区域,直接耦合到采样的光子的角分布。这些AXP的Comptel上限所施加的约束被提到。

英文摘要:

The paradigm for Anomalous X-ray Pulsars (AXPs) has evolved recently with the discovery by INTEGRAL and RXTE of flat, hard X-ray components in three AXPs. These non-thermal spectral components differ dramatically from the steeper quasi-power-law tails seen in the classic X-ray band in these sources, and can naturally be attributed to activity in the magnetosphere. Resonant, magnetic Compton upscattering is a candidate mechanism for generating this new component, since it is very efficient in the strong fields present near AXP surfaces. In this paper, results from an inner magnetospheric model for upscattering of surface thermal X-rays in AXPs are presented, using a kinetic equation formalism and employing a QED magnetic scattering cross section. Characteristically flat and strongly-polarized emission spectra are produced by non-thermal electrons injected in the emission region. Spectral results depend strongly on the observer's orientation and the magnetospheric locale of the scattering, which couple directly to the angular distributions of photons sampled. Constraints imposed by the Comptel upper bounds for these AXPs are mentioned.

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