Search for gamma-rays above 400 GeV from Geminga

Details Search for gamma-rays above 400 GeV from Geminga Search for gamma-rays above 400 GeV from Geminga

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1..173c&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 173-176 (SEE N85-33902 22-93)

Physics

1

Cerenkov Counters, Emissivity, Flux (Rate), Gamma Rays, High Energy Interactions, Periodic Variations, Energy Levels, Flux Density, Pulsed Radiation, Radiation Sources

Scientific paper

Observations of Geminga made at the Whipple Observatory using the atmospheric Cherenkov technique during the moonless periods of November 1983 to February 1984 and November 1984 till February 1985 were examined for evidence for the emission of gamma rays with energy in excess of approx 400 GeV. Evidence of either a steady flux or a flux pulsed with a period near 60 seconds were studied. In neither case was any significant effect observed, enabling the establishment 3 of sigma upper limits of 5.5 x 10 to the -11th power photons/sq cm/s and 2.0 x 10 to the -11th power photons/sq cm/s for the steady and pulsed emission respectively. The limit to the pulsed flux is approximately a factor of six below that predicted.

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