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The diffuse gamma-ray flux from clusters of galaxies

Author

Listed:
  • Saqib Hussain

    (University of São Paulo (USP)
    Gran Sasso Science Institute)

  • Rafael Alves Batista

    (Instituto de Física Teórica UAM-CSIC
    Universidad Autónoma de Madrid)

  • Elisabete M. de Gouveia Dal Pino

    (University of São Paulo (USP))

  • Klaus Dolag

    (University Observatory Munich
    Max Planck Institute for Astrophysics)

Abstract

The origin of the diffuse gamma-ray background (DGRB), the one that remains after subtracting all individual sources from observed gamma-ray sky, is unknown. The DGRB possibly encompasses contributions from different source populations such as star-forming galaxies, starburst galaxies, active galactic nuclei, gamma-ray bursts, or galaxy clusters. Here, we combine cosmological magnetohydrodynamical simulations of clusters of galaxies with the propagation of cosmic rays (CRs) using Monte Carlo simulations, in the redshift range z ≤ 5.0, and show that the integrated gamma-ray flux from clusters can contribute up to 100% of the DGRB flux observed by Fermi-LAT above 100 GeV, for CRs spectral indices α = 1.5 − 2.5 and energy cutoffs $${E}_{\max }=1{0}^{16}-1{0}^{17}$$ E max = 1 0 16 − 1 0 17 eV. The flux is dominated by clusters with masses 1013 ≲ M/M⊙ ≲ 1015 and redshift z ≲ 0.3. Our results also predict the potential observation of high-energy gamma rays from clusters by experiments like the High Altitude Water Cherenkov (HAWC), the Large High Altitude Air Shower Observatory (LHAASO), and potentially the upcoming Cherenkov Telescope Array (CTA).

Suggested Citation

  • Saqib Hussain & Rafael Alves Batista & Elisabete M. de Gouveia Dal Pino & Klaus Dolag, 2023. "The diffuse gamma-ray flux from clusters of galaxies," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38226-w
    DOI: 10.1038/s41467-023-38226-w
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    References listed on IDEAS

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    1. Matt A. Roth & Mark R. Krumholz & Roland M. Crocker & Silvia Celli, 2021. "The diffuse γ-ray background is dominated by star-forming galaxies," Nature, Nature, vol. 597(7876), pages 341-344, September.
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