Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..429b&link_type=abstract
Astrophysical Journal, Part 1, vol. 244, Mar. 1, 1981, p. 429-435.
Astronomy and Astrophysics
Astronomy
74
Cosmic X Rays, Energy Spectra, Galactic Nuclei, Heao 1, Radio Galaxies, X Ray Sources, Active Galaxies, Astronomical Models, Black Holes (Astronomy), Compton Effect, Gamma Ray Astronomy, X Ray Spectra
Scientific paper
The active-nucleus galaxy Centaurus A has been studied at 2 keV-2.3 MeV using data from the UCSD/MIT hard X-ray and low-energy gamma-ray instrument and the GSFC/CIT cosmic X-ray experiment on HEAO-1. It is found that an E exp -1.60 + or - 0.03 power law spectrum breaking to E exp -2.0 + or - 0.2 at 140 keV best describes the January and July 1978 data. The average intensity was 50% higher during the January observations. Upper limits to unresolved lines at 511 keV and 1.6 MeV were found to be 6.5 x 10 to the -4th photons/sq cm-s and 2.2 x 10 to the -4th photons/sq cm-s, respectively, at the 90% confidence level. The present data are consistent with the detailed calculations of the synchrotron self-Compton mechanism; they may also agree, marginally, with the predictions of emission from spherical accretion onto black holes.
Baity William A.
Gruber Duane E.
Knight Frederick K.
Levine Alan M.
Lewin Walter H. G.
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