Evidence for the detection of gamma rays from Centaurus A at gamma-ray energies above 300 GeV

Details Evidence for the detection of gamma rays from Centaurus A at gamma-ray energies above 300 GeV Evidence for the detection of gamma rays from Centaurus A at gamma-ray energies above 300 GeV

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...197l...9g&link_type=abstract

Astrophysical Journal, vol. 197, Apr. 1, 1975, pt. 2, p. L9-L12. Research supported by the Smithsonian Institution, Australian

Astronomy and Astrophysics

Astronomy

100

Cosmic Ray Showers, Galactic Nuclei, Galactic Radiation, Gamma Rays, Radiation Measurement, Active Galaxies, Background Radiation, Cerenkov Counters, Compton Effect, Primary Cosmic Rays, Radiant Flux Density, X Ray Astronomy

Scientific paper

Results of extended observations of the active galaxy NGC 5128 (Cen A) at energies above 100 GeV are presented. Data were recorded from three observing periods (1972-1974) in Australia. The atmospheric Cerenkov technique was used, together with partial cosmic-ray rejection, to search for gamma-ray-initiated extensive air showers from the direction of Cen A. A 4.5 sigma (time-averaged) excess over background was detected. Some implications of this probable gamma-ray flux are discussed.

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