A search of the northern sky for ultra-high-energy point sources

Details A search of the northern sky for ultra-high-energy point sources A search of the northern sky for ultra-high-energy point sources

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383l..53a&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 383, Dec. 20, 1991, p. L53-L56. Research supported by NSF, Los Al

Astronomy and Astrophysics

Astronomy

33

Cosmic Ray Showers, Gamma Rays, Northern Sky, Point Sources, Sky Surveys (Astronomy), Energy Spectra, Particle Energy, Particle Flux Density

Scientific paper

A search has been made for steady emission of ultra-high-energy radiation from individual point sources over most of the northern sky. Over 2 x 10 exp 8 air showers induced by primary particles of energy greater than about 10 TeV were recorded from April 1986 until May 1991 by the Cygnus air shower array. No statistically significant excess above the background from the isotropic flux of cosmic rays was found for any direction in the sky from 0 to 80 deg declination. In addition, 49 specific potential sources were examined, and none showed a statistically significant excess of events. Ninety-percent confidence level flux upper limits are established for the continuous emission from these sources; for a source that transits the zenith, a representative upper limit corresponds to an integral flux above 40 TeV of about 1.7 x 10 exp -13/sq cm s (0.5 percent of the cosmic-ray flux within an angular area of 0.0018 sr) assuming a power-law energy spectrum with a differential spectral index of -2.7.

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