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On the Contribution of Unresolved Pulsars to the Ultra-high-energy Galactic Diffuse Gamma-Ray Emission

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arxiv 2407.20186 v2 pith:VXRQEDX6 submitted 2024-07-29 astro-ph.HE

Samy Kaci , Gwenael Giacinti , Dmitri Semikoz This is my paper · ORCID
classification astro-ph.HE
keywords contributionunresolveddiffusesourcesaboveemissiongalacticgalaxy
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abstract

The ultra high-energy (UHE) Galactic diffuse gamma-ray emission holds important information on the propagation of cosmic rays in the Galaxy. However, its measurements suffer from a contamination from unresolved sources whose contribution remains unclear. In this Letter, we propose a novel data-driven estimate of the contribution of unresolved pulsar wind nebulae and TeV halos based on the information present in the ATNF and the LHAASO catalogs. We find that in the inner Galaxy, this contribution is limited to $\sim38\%\pm10\%$ of the diffuse flux measured by LHAASO at $\sim20\,\rm{TeV}$ in the case where all sources associated to pulsars contribute as unresolved sources, and this fraction drops with energy to less than $21\%\pm6\%$ above $100\,\rm{TeV}$. In the outer Galaxy, this contribution is always subdominant. In particular, it reaches at most $\sim18\%\pm2\%$ at $10\,\rm{TeV}$ and is less than $\sim7\%\pm1\%$ above $\sim25\,\rm{TeV}$. We conclude that the UHE Galactic diffuse gamma-ray emission cannot be dominated by unresolved pulsar sources above a few tens of $\rm{TeV}$.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Breaking Dark: Hunting Heavy Decaying Dark Matter with Tibet AS$_\gamma$ and LHAASO-KM2A

    hep-ph 2025-09 conditional novelty 5.0 of 10

    Tibet ASγ and LHAASO-KM2A diffuse gamma-ray data exclude decaying dark matter lifetimes below about 10^28 seconds for masses around 10^6-10^9 GeV, for many Standard Model final states.

  2. Leptonic and hadronic models of high-energy nebula around V4641 Sgr

    astro-ph.HE 2025-12 conditional novelty 4.0 of 10

    Protons produce the >100 TeV gamma-ray halo of V4641 Sgr while freshly accelerated electrons produce its X-rays, a mixed leptohadronic model that matches the observed spectrum and morphology.

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