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arXiv 2107.02140astro-ph.HEhep-ph
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LHAASO J0621 $+$ 3755的多波长gamma-ray光谱的自洽解释

Self-consistent interpretations of the multi-wavelength gamma-ray spectrum of LHAASO J0621$+$3755

Kun Fang, Shao-Qiang Xi, Xiao-Jun Bi

摘要:

LHAASO J 0621 $+$ 3755是由LHAASO-KM 2A新发现的TeV γ射线晕。它很可能是由PSR J 0622 $+$ 3749周围慢扩散区中捕获的电子通过逆康普顿散射产生的。当对LHAASO-KM 2A的γ能谱进行拟合时,由常用的单区正态扩散电子传输模型得到的GeV通量明显高于Fermi-LAT的上限。本文分别采用单区超扩散模型和两区正扩散模型来解决这一矛盾。对于超扩散情形,我们发现具有超扩散指数$α\lesssim1.2$的模型可以满足Fermi-LAT观测的约束条件.对于双区扩散情景,慢扩散区的大小需要小于$\sim50$ pc,这与理论预期一致。未来对Geminga晕的精确测量可能会进一步区分脉冲星晕中电子传播的这两种情况。

英文摘要:

LHAASO J0621$+$3755 is a TeV gamma-ray halo newly identified by LHAASO-KM2A. It is likely to be generated by electrons trapped in a slow-diffusion zone around PSR J0622$+$3749 through inverse Compton scattering. When the gamma-ray spectrum of LHAASO-KM2A is fitted, the GeV fluxes derived by the commonly used one-zone normal diffusion model for electron propagation are significantly higher than the upper limits (ULs) of Fermi-LAT. In this work, we respectively adopt the one-zone superdiffusion and two-zone normal diffusion models to solve this conflict. For the superdiffusion scenario, we find that a model with superdiffusion index $α\lesssim1.2$ can meet the constraints of Fermi-LAT observation. For the two-zone diffusion scenario, the size of the slow-diffusion zone is required to be smaller than $\sim50$ pc, which is consistent with theoretical expectations. Future precise measurements of the Geminga halo may further distinguish between these two scenarios for the electron propagation in pulsar halos.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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