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arXiv 2203.00880astro-ph.HE
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极端BL湖泊中硬TeV谱的两区模型

A Two-Zone Model as origin of Hard TeV Spectrum in Extreme BL Lacs

E. Aguilar-Ruiz, N. Fraija, A. Galvan-Gamez, E. Benítez

摘要:

所谓的极端BL Lac的发射对粒子加速模型提出了挑战。他们的光谱,$\lesssim 2$,在高能量带的硬度要求不寻常的参数使用标准的单区同步自康普顿(SSC)模型与不足磁化等离子体。一些作者使用两带或强子/轻强子模型来放松这些非典型值。在这项工作中,我们提出了一个轻强子双带模型来解释六个最著名的\textit{extreme} BL Lac的多波长观测。在活动星系核附近的一个团状物中,甚高能γ射线的观测是由光强子过程描述的,而在外部团状物中,观测是由SSC和外部逆康普顿过程描述的。光强子相互作用发生在加速质子与湮灭线光子从一个亚相对论对等离子体相互作用的内部blob。X射线观测由来自外部斑点的同步辐射描述。用我们的唯象模型描述每个物体的光谱能量分布得到的参数值彼此相似,并且位于BL Lac中报道的典型范围内。

英文摘要:

The emission of the so-called extreme BL Lacs poses challenges to the particle acceleration models. The hardness of their spectrum, $\lesssim 2$, in the high-energy band demands unusual parameters using the standard one-zone synchrotron self-Compton (SSC) model with a deficient magnetized plasma. Some authors use either two-zone or hadronic/lepto-hadronic models to relax these atypical values. In this work, we present a lepto-hadronic two-zone model to explain the multi-wavelength observations of the six best-known \textit{extreme} BL Lacs. The very-high-energy gamma-ray observations are described by the photo-hadronic processes in a blob close to the AGN core and by SSC and external inverse Compton-processes in an outer blob. The photo-hadronic interactions occur when accelerated protons in the inner blob interact with annihilation line photons from a sub-relativistic pair plasma. The X-ray observations are described by synchrotron radiation from the outer blob. The parameter values found from the description of the spectral energy distribution for each object with our phenomenological model are similar to each other, and lie in the typical range reported in BL Lacs.

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