论文标题
伽玛 - 射线脉冲星光环hess J1831 $ - $ 098的功能
Features of the gamma-ray pulsar halo HESS J1831$-$098
论文作者
论文摘要
γ-射线脉冲星光晕是脉冲星脉风中的星系局部区域和电子注入的宇宙射线传播的理想指标。 Hess〜J1831 $ - $ 098是H.E.S.S.观察到的候选Pulsar Halo和HAWC实验。我们采用H.E.S.S.的通量图银河飞机调查和H.E.S.S.的光谱测量值和\ textit {fermi} -lat学习HESS〜J1831 $ - $ 098。我们发现Hess〜J1831 $ - $ 098符合Pulsar Halo的所有标准。光环内部的扩散系数以及从脉冲星向下旋转能量到电子能的转化效率都类似于geminga halo，geminga halo是一种典型的脉冲星晕。注射频谱可以通过指数截距的力量法来很好地描述。但是，如果扩散系数在空间和时间上是独立的，则所需的幂律术语非常困难，而$ p \ lyssim1 $。考虑到缓慢扩散环境的可能起源，我们采用了两区扩散模型和时间延迟的慢速扩散模型。两种模型都可以解释H.E.S.S.和\ textit {fermi} -lat结果，带有较温和的$ p $。修改后的注射时间曲线可能具有相似的效果。
Gamma-ray pulsar halos are ideal indicators of cosmic-ray propagation in localized regions of the Galaxy and electron injection from pulsar wind nebulae. HESS~J1831$-$098 is a candidate pulsar halo observed by both H.E.S.S. and HAWC experiments. We adopt the flux map of the H.E.S.S. Galactic plane survey and the spectrum measurements of H.E.S.S. and \textit{Fermi}-LAT to study HESS~J1831$-$098. We find that HESS~J1831$-$098 meets all the criteria for a pulsar halo. The diffusion coefficient inside the halo and the conversion efficiency from the pulsar spin-down energy to the electron energy are both similar to the Geminga halo, a canonical pulsar halo. The injection spectrum can be well described by an exponentially-cutoff power law. However, the needed power-law term is very hard with $p\lesssim1$ if the diffusion coefficient is spatially and temporally independent. Considering the possible origins of the slow-diffusion environment, we adopt the two-zone diffusion model and the time-delayed slow-diffusion model. Both the models can interpret the H.E.S.S. and \textit{Fermi}-LAT results with a milder $p$. A modified injection time profile may have a similar effect.
