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1. Upper limits to the flux of high energy γ-rays from selected quasi-stellar and other sources, using the Cerenkov technique

Author

C. D. Long, J. V. Jelley, T. C. Weekes, J. F. Fruin, and N.A. Porter

Subjects
Physics, Stars, Photon, Crab Nebula, Flux, Cosmic ray, Astrophysics, Absorption (electromagnetic radiation), Energy (signal processing), Magnetic field
Abstract

Upper flux limits at the earth for γ rays of energy greater than about 5 × 1012 eV, have been established for the quasi-stellar sources 3C 147, 3C 196, 3C 273, the Crab Nebula, and the magnetic variable 53 Cam. They are all of the order 10-10 photons cm-2. s-1. Corresponding upper energy limits at emission are of the order 5 × 1047 ergs s-1 for the quasi-stellar sources, and 5 × 1035 ergs s-1 for the Crab Nebula, if γ-ray absorption is assumed negligible. Possible absorption mechanisms are discussed.

Published
1965

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