A Search for Low-energy Gamma-rays from the Quasar 3C286

Details A Search for Low-energy Gamma-rays from the Quasar 3C286 A Search for Low-energy Gamma-rays from the Quasar 3C286

Jul 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965natur.207..396a&link_type=abstract

Nature, Volume 207, Issue 4995, pp. 396 (1965).

Physics

1

Scientific paper

IN two experiments on the Ranger spacecraft, Metzger et al.1 have observed a flux of low-energy γ-rays at great distances from the Earth. Previous experiments on high-altitude balloons2,3 and on rockets4 had looked for, but failed to detect, an isotropic flux of γ-rays incident on the top of the Earth's atmosphere. These experiments used counters with little or no directional sensitivity, and their failure was due to the difficulty in distinguishing between an isotropic primary flux from the background of secondary γ-rays produced by cosmic rays in the atmosphere and in the apparatus itself. However, even in the presence of this background, a counter with directional sensitivity can detect γ-rays from point sources by measuring increases in the total flux in particular directions in the sky. We report here the results of observations made at balloon altitude on the quasar 3C286.

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