Evidence for the detection of gamma rays from Centaurus A at Egamma ≥ 3×1011eV.
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1975
- DOI:
- 10.1086/181764
- Bibcode:
- 1975ApJ...197L...9G
- Keywords:
-
- 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;
- Space Radiation