Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.282..484p&link_type=abstract
Nature, vol. 282, Nov. 29, 1979, p. 484-486.
Astronomy and Astrophysics
Astronomy
46
Energy Spectra, Gamma Ray Astronomy, Gamma Ray Spectra, Seyfert Galaxies, Particle Energy, Photoelectron Spectroscopy, Telescopes, X Ray Astronomy, X Ray Spectra, Zenith
Scientific paper
Detailed results of the observation of the Seyfert galaxy NGC 4151 in the energy range 0.04 - 20 MeV by the balloon-borne MISO telescope are presented. Observations were made on May 22, 1977 at zenith angles of 18 and 7 deg over a period of about three hours by the instruments consisting of a Compton coincidence detector with an aperture of 3 x 20 deg FWHM at altitudes between 6.2 and 8.0 mbar. A total gamma-ray excess of 7.2 + or - 1.2 cps was observed at a position coinciding with that of NGC 4151, and a photon spectrum for the top of the atmosphere derived from the energy loss spectra in each of the three telescope channels is presented, together with previous X-ray measurements. Exponential and power-law fits to the data are calculated for energies greater than 200 keV and between 10 and 200 keV, respectively, noting the gamma-ray variability of the source, and possible mechanisms for the emission are considered.
Baker Ronald E.
Butler Reginald C.
Dean Anthony J.
Di Cocco Guido
Martin Jaime San
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