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arXiv 0705.2530astro-ph
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蟹状星云巨脉冲的产生

On generation of Crab giant pulses

Maxim Lyutikov

摘要:

我们提出蟹状巨脉冲是在光圆柱附近的闭合磁场线上通过普通模的反常回旋共振产生的。波在一组精细的、不均匀间隔的、窄的发射带中以远低于局部回旋频率的频率产生。发射带的位置与Eilek等人(2006年)观察到的光谱结构相吻合。为了重现这些数据,在巨脉冲发射区所需的等离子体密度要比最小的Goldreich-Julian密度高出$\sim 3 \times 10^5$倍。发射是由一群高能粒子产生的,这些粒子具有辐射限制的洛伦兹因子$γ\sim 7 \times 10^7$,在靠近Y点的偶然重联过程中产生,在Y点处,最后的闭合场线接近光柱。

英文摘要:

We propose that Crab giant pulses are generated on closed magnetic field lines near the light cylinder via anomalous cyclotron resonance on the ordinary mode. Waves are generated in a set of fine, unequally spaced, narrow emission bands at frequencies much lower than a local cyclotron frequency. Location of emission bands is fitted to spectral structures seen by Eilek et al. (2006). To reproduce the data, the required density of plasma in the giant pulses emission region is much higher, by a factor $\sim 3 \times 10^5$, than the minimal Goldreich-Julian density. Emission is generated by a population of highly energetic particles with radiation-limited Lorentz factors $γ\sim 7 \times 10^7$, produced during occasional reconnection close to the Y point, where the last closed field lines approach the light cylinder.

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