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The TeV gamma-ray luminosity of the Milky-Way and the contribution of H.E.S.S. unresolved sources to VHE diffuse emission

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arxiv 2006.04106 v1 pith:ZXGOULX7 submitted 2020-06-07 astro-ph.HE hep-ph

classification astro-ph.HEhep-ph
keywords sourcesgalacticpopulationpulsarcontributiondiffuseemissionenergy
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abstract

H.E.S.S. has recently completed a systematic survey of the Galactic plane in the TeV energy domain. We analyze the flux, latitude and longitude distributions of $\gamma-$ray sources observed by H.E.S.S. in order to infer the properties of Galactic TeV source population. We show that the total Milky-Way luminosity in the 1-100 TeV energy range is $L_{\rm MW} = 1.7^{+0.5}_{-0.4}\times 10^{37} {\rm ergs}\,{\rm sec}^{-1}$. Evaluating the cumulative flux expected at Earth by the considered population, we show that H.E.S.S. unresolved sources provide a relevant contribution to the diffuse Galactic emission. Finally, in the hypothesis that the majority of bright sources detected by H.E.S.S. are powered by pulsar activity, like e.g. Pulsar Wind Nebulae or TeV halos, we estimate the main properties of the pulsar population.

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  1. LHAASO protons versus LHAASO diffuse gamma-rays: a consistency check

    astro-ph.HE 2025-06 conditional novelty 6.0 of 10

    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.

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