Analysis of gamma-ray production reveals discrepancies with LHAASO observations, suggesting model revisions.
We model the hadronic gamma-ray production in the Galaxy using an updated phenomenological description of the cosmic ray spectra and different Galactic gas templates. We find a persistent discrepancy in both normalization and spectral shape between the predicted gamma-ray flux and observations by LHAASO. We conclude that the local cosmic-ray proton flux measured by LHAASO overshoots the Galactic gamma-ray emission observed in the TeV-PeV sky, calling for a revision of current cosmic ray models.
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Castro et al. (2025) studied this question.
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