西藏空气簇射阵列探测到的银河系弥散伽马射线中源贡献的定量约束
高能天体物理现象
2023-10-11 v2
摘要
西藏空气簇射阵列观测到的银河系弥散伽马射线中尚未分辨的伽马射线源贡献比例，是解释近期多信使观测的关键。本文展示了一个令人惊讶的事实：西藏阵列在398TeV以上未探测到任何来自LHAASO新发现的100TeV以上伽马射线源的事件。基于这一观测事实，估计LHAASO未分辨源对西藏弥散事件的贡献在398TeV以上小于31%（99%置信水平）。我们的结果表明，未分辨源对398TeV以上的西藏弥散事件仅起次要贡献，大部分事件确属弥散性质。
引用
@article{arxiv.2309.16078,
title = {Quantitative constraint on the source contribution to the Galactic diffuse gamma rays detected by the Tibet air shower array},
author = {S. Kato and D. Chen and J. Huang and T. Kawashima and K. Kawata and A. Mizuno and M. Ohnishi and T. Sako and T. K. Sako and M. Takita and Y. Yokoe},
journal= {arXiv preprint arXiv:2309.16078},
year = {2023}
}
备注
Calculations in Eq-(2) should have used the probability p that a Tibet diffuse gamma-ray event is of unresolved-source origin, but the parameter p in Eq-(2) is the probability that a gamma-ray event above 398 TeV from a source marginally detected by LHAASO is detected by the Tibet. This mistake leads to a wrong estimate of the limit on the source fraction to the Tibet diffuse gamma-ray events