Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..555b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 15, 1984, p. 555-562.
Astronomy and Astrophysics
Astronomy
56
Gamma Ray Astronomy, Seyfert Galaxies, Spaceborne Astronomy, X Ray Spectra, Black Holes (Astronomy), Energy Spectra, Galactic Nuclei, Gamma Ray Spectra, Heao 1, Power Spectra, Synchrotron Radiation
Scientific paper
Broad-range X-ray and gamma-ray spectra of the Seyfert galaxy NGC 4151 obtained by the UCSD/MIT and GSFC/CIT detectors of HEAO 1 are presented. For two out of the three observational epochs the best-fit model is a power law with photon index 1.6 + or - 0.1 in the 2 keV-2 MeV spectral range. The third observation, in June, 1978, when the intensity was a factor of 2 higher, requires a change above 50 keV from a similar power law to a steeper power law or an exponential. Through comparisons with previous observations, a weak correlation is found between the high-energy spectral index and the flux level. Comparison of these data and other X-ray and gamma-ray observations with the spectra expected from several possible emission mechanisms supports a synchrotron-self-Compton model using infrared target photons or a Compton-scattering process involving X-rays of less than 10 keV energies.
Baity William A.
Mushotzky Richard F.
Primini Francis A.
Rothschild Richard E.
Tennant Allyn F.
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