Observation and search for gamma rays 1-20 MeV from the Crab, NGC 4151, CYG X-1, CYG X-3, CG 135+1 and 3C 273

Details Observation and search for gamma rays 1-20 MeV from the Crab, NGC 4151, CYG X-1, CYG X-3, CG 135+1 and 3C 273 Observation and search for gamma rays 1-20 MeV from the Crab, NGC 4151, CYG X-1, CYG X-3, CG 135+1 and 3C 273

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.284..608w&link_type=abstract

Nature, vol. 284, Apr. 17, 1980, p. 608-610. NSF-NASA-supported research.

Astronomy and Astrophysics

Astronomy

35

Black Holes (Astronomy), Crab Nebula, Gamma Ray Astronomy, Quasars, Seyfert Galaxies, Background Radiation, Diffuse Radiation, Radiant Flux Density, X Ray Telescopes

Scientific paper

Observations and limiting values for the flux of 1-20 MeV gamma rays from the Crab, the Seyfert galaxy NGC 4151, the black hole candidate Cyg X-1, Cyg X-3 and the two nearest quasars CG 135+1 and 3C 273 are reported. Measurements of the energy and scatter angle of gamma rays at zenith angles between 10 and 30 deg were obtained by a balloon-borne double-scatter gamma-ray telescope. The flux from the Crab from 1.2 to 10 MeV is found to be 0.0039 + or - 0.0020 photons/sq cm per sec, and the energy distribution of the flux from 1.2 to 20 MeV is determined. Two-standard-deviation upper limits to the gamma-ray flux in the intervals 1.2-3, 3-5, 5-10 and 10-20 MeV of 0.0003, 0.0002, 0.00006 and 0.00004 photons/sq cm/sec are found for NGC 4151, Cyg X-1 and Cyg X-3, while those of 0.0005, 0.0003, 0.0001 and 0.00004 photons/sq cm per sec are determined for both quasars. These upper limits are interpreted as restricting confirmed gamma-ray sources to the Crab and NP 0532, and as evidence against Seyfert galaxies as the source of cosmic diffuse radiation.

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