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arXiv 1902.08205astro-ph.HE
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Blazar喷流中的粒子加速和同步自康普顿辐射I:对静态辐射的应用

Particle acceleration and synchrotron self-Compton emission in blazar jets I : an application to the quiescent emission

Y. G. Zheng, S. J. Kang, C. Y. Yang, J. M. Bai

摘要:

关于静止时期粒子加速和逃逸的细节,还有一些重要的问题没有得到解答。因此,在blazar静止光谱模型中采用的粒子分布具有许多不受约束的形状。为了解决这个问题,我们引入了一个解析的粒子输运模型来再现blazar的静态宽带光谱能量分布。在这个模型中,精确的电子分布是从一个广义的输运方程,其中包含的条款描述一阶和二阶\emph{Fermi}加速,逃逸粒子由于平流和空间扩散,能量损失由于同步辐射和逆康普顿散射的假设软光子场。我们认为平流是耀变体喷流中一种重要的逃逸机制。我们发现,在我们的模型中,平流过程往往硬化粒子分布,这增强了所产生的同步辐射和同步辐射自康普顿谱的高能成分从喷流。我们的模型能够粗略地再现观测到的光谱的极端BL Lac对象1ES 0414+009与合理的假设的物理参数。

英文摘要:

There are still some important unanswered questions about the detailed particle acceleration and escape occurring during the quiescent epoches. As a result, the particle distribution that is adopted in the blazar quiescent spectral model have numerous unconstrained shapes. To help remedy this problem, we introduce a analytical particle transport model to reproduce quiescent broadband spectral energy distribution of blazar. In this model, the exact electron distribution is solved from a generalized transport equation that contains the terms describing first-order and secondary-order \emph{Fermi} acceleration, escape of particle due to both the advection and spatial diffusion, energy losses due to synchrotron emission and inverse-Compton scattering of an assumed soft photon field. We suggest that the advection is a significant escape mechanism in blazar jet. We find that in our model the advection process tends to harden the particle distribution, which enhances the high energy components of resulting synchrotron and synchrotron self-Comptom spectrum from jet. Our model is able to roughly reproduce the observed spectra of extreme BL Lac object 1ES 0414+009 with reasonable assumptions about the physical parameters.

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