EVIDENCE FOR SECONDARY EMISSION AS THE ORIGIN OF HARD SPECTRA IN TeV BLAZARS

EVIDENCE FOR SECONDARY EMISSION AS THE ORIGIN OF HARD SPECTRA IN TeV BLAZARS
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二次发射作为 TeV 耀斑中硬光谱起源的证据

DOI:
10.1088/0004-637x/764/2/113
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发表时间:
2013-01
影响因子:
4.9
通讯作者:
Kang, T.
Kang, T.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zheng, Y. G.;Kang, T.

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我们开发了一个模型,用于研究遥远耀变体的硬极高能(VHE)光谱的可能起源。在该模型中,源中产生的初级光子和源外产生的次级光子都有助于观测到的高能 γ 射线发射。也就是说,初级光子是通过同步加速器自康普顿过程产生的,次级光子是通过高能质子沿视线与背景光子相互作用产生的。我们将该模型应用于遥远耀变体 1ES 1101-232 中 VHE γ 射线发射的典型情况。假设合适的电子和质子光谱,我们获得了与观察到的该耀变体光谱的极好拟合。这表明高能γ射线的衰减惊人地低,尤其是观测到的光谱中VHEγ射线尾部的形状,可以用宇宙射线质子与星系际空间中的背景光子相互作用产生的次级γ射线来解释。
We develop a model for the possible origin of hard, very high energy (VHE) spectra from a distant blazar. In the model, both the primary photons produced in the source and secondary photons produced outside it contribute to the observed high-energy γ-ray emission. That is, the primary photons are produced through the synchrotron self-Compton process, and the secondary photons are produced through high-energy proton interactions with background photons along the line of sight. We apply the model to a characteristic case of VHE γ-ray emission in the distant blazar 1ES 1101-232. Assuming suitable electron and proton spectra, we obtain excellent fits to the observed spectra of this blazar. This indicated that the surprisingly low attenuation of the high-energy γ-rays, especially the shape of the VHE γ-ray tail of the observed spectra, can be explained by secondary γ-rays produced in interactions of cosmic-ray protons with background photons in intergalactic space.
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