Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.292..133p&link_type=abstract
Nature, vol. 292, July 9, 1981, p. 133-135.
Astronomy and Astrophysics
Astronomy
48
Emission Spectra, Galactic Radiation, Gamma Ray Astronomy, Gamma Ray Spectra, Seyfert Galaxies, Active Galactic Nuclei, Background Radiation, Balloon-Borne Instruments, Gamma Ray Bursts, Gamma Ray Telescopes, Stochastic Processes
Scientific paper
The detection of soft gamma-ray emission from the region containing the Type I Seyfert galaxy MCG8-11-11 is reported. Observations were made with the Milan/Southampton (MISO) low energy gamma-ray telescope, which consists of a Compton-coincidence detection system inside a semiactive shield, during a balloon flight from Palestine, Texas in September, 1979. A significant gamma-ray counting-rate excess was observed within an error box containing MCG8-11-11 as the only known X-ray source apart from the OSO 7 source 1M0600+46, for which the error box is not available. Evaluation of the emission spectrum in the energy range 0.02-19 MeV reveals it to be similar to that of the Seyfert galaxy NGC 4151, in which a spectral cutoff close to 3 MeV was observed. The spectral feature may be explained by the stochastic generation of gamma-ray bursts by the Penrose-Compton scattering mechanism in active galactic nuclei. Gamma-ray emission from Seyfert galaxies is also suggested to be capable of accounting for a large portion of the observed low-energy diffuse gamma-ray background, which is noted to exhibit a 3-MeV cutoff.
Butler Reginald C.
Carter J. N.
Dean Anthony J.
Della Ventura A.
Di Cocco Guido
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