Search for 100 TeV γ-ray emission from the galactic disk

M. Aglietta, B. Alessandro, F. Arneodo, L. Bergamasco, A. Campos Fauth, C. Castagnoli, A. Castellina, C. Cattadori, A. Chiavassa, G. Cini, B. D'Ettorre Piazzoli, W. Fulgione, P. Galeotti, P. L. Ghia, G. Mannocchi, C. Morello, G. Navarra, L. Riccati, O. Saavedra, G. C. TrincheroP. Vallania, S. Vernetto

Research output: Contribution to journalArticlepeer-review


A search for UHE (≥ 100 TeV) diffuse γ-ray emission from the Galactic disk has been carried out, through the excess in the cosmic-ray counting rate, by means of the EAS-TOP extensive air shower array at the Gran Sasso Laboratories. Measurements are performed from angular scales |b| ≈ 2° (as in 100 MeV satellite experiments, and as expected from CR interactions with the ISM) to |b| ≈ 10°. The obtained upper limits (90% c.l.) to the γ-ray excess over the cosmic-ray flux from the Galactic disk region are Iγ/Ip < 0.2% for |b| < 2°, Iγ/Ip < 0.04% for |b| < 5°, and Iγ/Ip < 0.02% for |b| < 12° at E0 > 130 TeV, corresponding to upper limits to the flux of Iγ < 3.2 × 10-13 cm-2 s-1 rad-1, Iγ < 2.8 × 10-13 cm-2 s-1 rad-1, and Iγ < 4 × 10-13 cm-2 s-1 rad-1.

Original languageEnglish (US)
Pages (from-to)148-152
Number of pages5
JournalAstrophysical Journal
Issue number1
StatePublished - 1992


  • Cosmic rays
  • Gamma rays: Observations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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