Upper limits for Northern Hemisphere 10 to the 15th eV gamma-ray sources

Details Upper limits for Northern Hemisphere 10 to the 15th eV gamma-ray sources Upper limits for Northern Hemisphere 10 to the 15th eV gamma-ray sources

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..145b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 1, 1985, p. 145-150.

Astronomy and Astrophysics

Astronomy

8

Gamma Ray Astronomy, Northern Sky, X Ray Sources, Cerenkov Radiation, Cosmic Ray Showers, Cygnus Constellation

Scientific paper

Flux limits in the range 10-13 to 10-12cm-2s-1 have been obtained by observing Cerenkov flashes from small air showers. Simultaneous drift scans by the 67 mirror units of the Utah Fly's Eye gave nearly full coverage of the northern hemisphere. During 1983, a 3.5 σ excess of showers was observed during the phase interval 0.2 - 0.3 of the 4.8 hr period of Cygnus X-3, but no excess was found in 1984 observations.

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