Potential contribution from gamma-ray sources to the Galactic diffuse gamma rays observed above 100 TeV (sub-PeV energy range) by the Tibet AS{\gamma} experiment is an important key to interpreting recent multi-messenger observations. This paper reveals a surprising fact: none of the 23 Tibet AS{\gamma} diffuse gamma-ray events above 398TeV within the Galactic latitudinal range of |b| < 10 deg. come from the 43 sub-PeV gamma-ray sources reported in the 1LHAASO catalog, which proves that these sources are not the origins of the Tibet AS{\gamma} diffuse gamma-ray events. No positional overlap between the Tibet AS{\gamma} diffuse gamma-ray events and the sub-PeV LHAASO sources currently supports the diffusive nature of the Tibet AS{\gamma} diffuse gamma-ray events, although their potential origin in the gamma-ray sources yet unresolved in the sub-PeV energy range cannot be ruled out.
@article{arxiv.2401.13120,
title = {On the source contribution to the Galactic diffuse gamma rays above 398 TeV detected by the Tibet AS{\gamma} experiment},
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:2401.13120},
year = {2024}
}
Comments
5 pages, 2 figures Accepted for publication from The Astrophysical Journal Letters. arXiv admin note: text overlap with arXiv:2309.16078