A Search for Discrete Sources of Cosmic Gamma Rays of Energies Near 2 X 10^{12} eV
Abstract
By use of the atmospheric cerenkov nightsky technique, a study has been made of the cosmic-ray air-shower distribution from the direction of thirteen astronomical objects. These include the Crab Nebula, M87, M82, quasi-stellar objects, X-ray sources, and recently exploded supernovae. An anisot- ropy in the direction of a source would indicate the emission of gamma rays of energy 2 X 1012 eV. No statistically significant effects were recorded. Upper limits of 3-30 X 10h1 gamma ray cm~ sec' were deduced for the individual sources
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1968
- DOI:
- 10.1086/180275
- Bibcode:
- 1968ApJ...154L..83F