arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.14946astro-ph.HEhep-ph
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VER J2227 +608的$γ$射线发射的强子模型和轻子模型

Hadronic vs leptonic models for $γ$-ray emission from VER J2227+608

Siming Liu, Houdun Zeng, Yuliang Xin, Hui Zhu

摘要:

最近对VER J2227+608的观测揭示了一个破碎的功率$γ$射线谱,谱指数从GeV能量范围的$\sim 1.8$增加到TeV能量范围的$\sim 2.3$.这样的光谱中断可以归因于高能电子的辐射能量损失的轻子场景中的$γ$射线发射,这与附近的脉冲星的特征年龄相结合,可以用来约束磁场的发射区域。我们表明,无线电和X射线观测也可以解释在这样的情况下。在强子的情况下,光谱断裂可以归因于高能离子在湍流介质中的扩散,详细的光谱测量可以用来约束扩散系数。然而,这两个模型预测了100 TeV以上截然不同的光谱,这将在未来的高分辨率观测中发现,如LHAASO和/或CTA。

英文摘要:

Recent observations of VER J2227+608 reveal a broken power $γ$-ray spectrum with the spectral index increasing from $\sim 1.8$ in the GeV energy range to $\sim 2.3$ in the TeV range. Such a spectral break can be attributed to radiative energy loss of energetic electrons in the leptonic scenario for the $γ$-ray emission, which, in combination with characteristic age of the nearby pulsar, can be used to constrain magnetic field in the emission region. We show that the radio and X-ray observations can also be explained in such a scenario. In the hadronic scenario, the spectral break can be attributed to diffusion of energetic ions in a turbulent medium and detailed spectral measurement can be used to constrain the diffusion coefficient. These two models, however, predict drastically different spectra above 100 TeV, which will be uncovered with future high-resolution observations, such as LHAASO and/or CTA.

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