The LHAASO proton spectrum, folded with gas maps and interaction models, predicts a diffuse gamma-ray flux that exceeds LHAASO's measured diffuse gamma-ray flux, especially in the inner Galaxy.
Unresolved sources naturally contribute to PeV $\gamma$-ray diffuse emission observed by Tibet AS$\gamma$
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abstract
The Tibet AS$\gamma$ experiment provided the first measurement of the total diffuse gamma-ray emission from the Galactic disk in the sub-PeV energy range. Based on the analysis of TeV sources included in the HGPS catalog, we predict the expected contribution of unresolved sources in the two angular windows of the Galactic plane observed by Tibet AS$\gamma$. We show that the sum of this additional diffuse component due to unresolved sources and the truly diffuse emission, due to cosmic ray interaction with the interstellar medium, well saturates the Tibet data, without the need to introduce a progressive hardening of the cosmic-ray spectrum toward the Galactic center.
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LHAASO protons versus LHAASO diffuse gamma-rays: a consistency check
The LHAASO proton spectrum, folded with gas maps and interaction models, predicts a diffuse gamma-ray flux that exceeds LHAASO's measured diffuse gamma-ray flux, especially in the inner Galaxy.