论文标题
Geminga Pulsar对正电子过剩的贡献的新估计值
New estimate for the contribution of the Geminga pulsar to the positron excess
论文作者
论文摘要
正电子过剩的起源是Astroparticle物理学中最有趣的谜团之一。最近发现了脉冲星geminga，Monogem和PSR J0621+3755周围扩展的$γ$ ray光环，这带来了间接证据表明，脉冲星风星可加速$ e^{\ pm} $，达到非常高的启动。虽然先前数据的精度不允许对PULSARS的参数进行精确评估，但我们能够使用Hawc和Lhaaso在2020年和2021年发布的新数据找到更精确的注射谱形状。我们发现这是由具有指数截止的PowerLAW很好地掩盖的。光谱指数非常困难，值约为1，而截止能量约为100 TEV。我们还得出了脉冲星周围扩散系数的强度，发现它比星系平均值低两个数量级。最后，我们使用上述结果来估计吉明加对正电子过剩的贡献。仅此源就可以在1 TEV左右促进整个正电子过多。
The origin of the positron excess is one of the most intriguing mysteries in astroparticle physics. The recent discovery of extended $γ$-ray halos around the pulsars Geminga, Monogem and PSR J0621+3755 have brought indirect evidence that pulsar wind nebulae accelerate $e^{\pm}$ up to very-high-energy. While the precision of previous data does not permit precise evaluation of the parameters for the pulsars, we are able to find the more precise shape of the injection spectrum using new data released by HAWC and LHAASO in 2020 and 2021. We find that this is well fitten by a power-law with an exponential cutoff. The spectral index is quite hard with values around 1 while the cutoff energy is roughly 100 TeV. We also derive the strength of the diffusion coefficient around the pulsars finding that it is two orders of magnitude lower than the average of the Galaxy. Finally, we use the above mentioned results to estimate the contribution of Geminga to the positron excess. This source alone can contribute to the entire positron excess at around 1 TeV.
