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arXiv 1208.5329astro-ph.HE
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脉冲星高能辐射的逆康普顿模型

Inverse Compton model of pulsar high energy emission

Maxim Lyutikov

摘要:

我们再现的宽带光谱的螃蟹脉冲星,从紫外线到非常高的能量伽马射线-近十年的能量,在回旋自康普顿模型的框架内。发射是由两个对流光束在外部间隙内产生的,距离大于$\sim$ 20 NS半径。向外移动的射束通过多普勒增强器回旋加速器发射产生UV- $X$ -射线光子,并且通过康普顿散射由向内行进的射束产生的回旋加速器光子产生GeV光子。散射发生在深层克莱因-西名制度,从而IC组件提供了一个直接测量磁层内的粒子分布。所需的等离子体多重性很高,$\sim 10^6-10^7$,但与注入脉冲星风星云的平均粒子通量一致。康普顿散射在克莱因-西名机制中的重要性也意味着外隙中对产生的重要性。我们认为外隙是脉冲星磁层中电子对的重要来源。脉冲星磁层中粒子的回旋运动可能是由于粒子流在异常回旋共振时相干发射无线电波而激发的。因此,从相干无线电波到非常高能量的$γ$射线(能量接近18个十年),蟹状星云的整个非热辐射范围可能是相互依赖的辐射过程的表现。目前的模型,以及有利于IC散射的观测证据(Lyutikov et al. 2012; Lyutikov 2012),表明逆康普顿散射可能是大多数恒星的主要高能发射机制。

英文摘要:

We reproduce the broadband spectrum of Crab pulsar, from UV to very high energy gamma-rays - nearly ten decades in energy, within the framework of the cyclotron-self-Compton model. Emission is produced by two counter-streaming beams within the outer gaps, at distances above $\sim$ 20 NS radii. The outward moving beam produces UV-$X$-ray photons via Doppler-booster cyclotron emission, and GeV photons by Compton scattering the cyclotron photons produced by the inward going beam. The scattering occurs in the deep Klein-Nishina regime, whereby the IC component provides a direct measurement of particle distribution within the magnetosphere. The required plasma multiplicity is high, $\sim 10^6-10^7$, but is consistent with the average particle flux injected into the pulsar wind nebula. The importance of Compton scattering in the Klein-Nishina regime also implies the importance of pair production in the outer gaps. We suggest that outer gaps are important sources of pairs in pulsar magnetospheres. Cyclotron motion of particles in the pulsar magnetosphere may be excited due to coherent emission of radio waves by streaming particles at the anomalous cyclotron resonance. Thus, a whole range of Crab non-thermal emission, from coherent radio waves to very high energy $γ$-rays - nearly eighteen decades in energy - may be a manifestation of inter-dependent radiation processes. The present model, together with the observational evidence in favor of the IC scattering (Lyutikov et al. 2012; Lyutikov 2012), demonstrates that the inverse Compton scattering can be the dominant high energy emission mechanism in majority of pulsars.

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